The Truth About Soy

The Truth About Soy

In recent years, I’ve received quite a number of requests from people asking for my views on soy products. Many of these inquiries have mentioned a stridently anti-soy article written by Sally Fallon and Mary G. Enig, titled “Tragedy and Hype,” that has been widely circulated. This article presents a systematic series of accusations against soy consumption, and has formed the basis for many similar articles. Large numbers of people, as a result, are now seriously questioning the safety of soy.

SoybeansThe litany of dangers with soy products, according to the article by Fallon and Enig, is nearly endless. Tofu, they say, shrinks brains and causes Alzheimer’s. Soy products promote rather than prevent cancer. Soy contains “antinutrients” and is full of toxins. The pro-soy publicity of the past few years is nothing but “propaganda.” Soy formula, they say, amounts to “birth control pills for babies.”

“Soy is not hemlock,” they conclude, “soy is more insidious than hemlock.”

Fallon and Enig say the soy industry knows soy is poisonous, and “lie(s) to the public to sell more soy.” They say that soy is “the next asbestos.” They predict that there will be huge lawsuits with “thousands and thousands of legal briefs.” They warn that those who will be held legally responsible for deliberately manipulating the public to make money “include merchants, manufacturers, scientists, publicists, bureaucrats, former bond financiers, food writers, vitamin companies, and retail stores.”

Given the rapidly expanding role that soy in its many forms has come to play in the Western diet, these accusations are extremely serious. If they are to be believed, the widespread trust that many people have come to have in soy is not only misplaced, but disastrous.

Soy foods have come to play such a significant role in the diets of many health conscious people, and the allegations that have been made against soy are so many and so grave, that I think the topic warrants a careful, detailed and meticulous look. What follows is my attempt to provide an objective appraisal of both the benefits and the dangers of soy.

Are Soy Foods a Blessing or a Curse?

It’s not that long ago that soybeans were considered by most Americans to be “hippie food.” But then medical research began accumulating, affirming that soy consumption reduced heart disease and cancer risk, that it lengthened lives and enhanced their quality, and that it provided an almost ideal protein to substitute for animal proteins that almost inevitably come packaged with cholesterol and unhealthy forms of saturated fat. The mainstream culture began taking note. In a 1999 article titled “The Joy of Soy” Time Magazine announced that consuming a mere 1.5 ounces of soy a day can significantly lower both total and LDL (“bad”) cholesterol levels. The evidence was becoming so convincing that even the ardently pro-pharmaceutical FDA wound up affirming that soybeans are a food that can prevent and even cure disease.

As the evidence of soy’s health benefits kept accumulating, sales and consumption skyrocketed. Books like The Simple Soybean and Your Health, Tofu Cookery, and The Book of Tofu helped spread the word. Annual soymilk sales, which amounted to only a few million dollars in the early 1980s, have now soared to more than a billion dollars. And it’s not just soy milk, it’s all soy foods. From 1996 to 2013, annual soy food sales in the U.S. literally quintupled — increasing from $1 billion to $4.5 billion.

But, according to the article by Sally Fallon and Mary Enig, this is all a tragic mistake, because soy is far indeed from living up to the many health claims that its proponents have made for it. Quite to the contrary, Fallon and Enig say, “the soybean contains large quantities of natural toxins or ‘antinutrients,’ (including) potent enzyme inhibitors that block the action of trypsin and other enzymes needed for protein digestion… They can produce serious distress, reduced protein digestion and chronic deficiencies in amino acid uptake.”

These are serious allegations, because soy is often consumed precisely for its considerable protein levels. In my view, there is a kernel of truth behind these charges, though one that Fallon and Enig greatly overstate. It is true that the protein in cooked soybeans is slightly less digestible than that found in most animal foods. However, when soybeans are made into soymilk, tofu, tempeh, and the other common forms of soyfoods, their protein digestibility is enhanced and becomes similar to animal foods. Any negative impact on protein digestibility due to the presence of the enzyme inhibitors found in soybeans is rendered nearly irrelevant in such foods. And even simple soybeans, with their reduced digestibility, are so high in protein and in all the essential amino acids that they could still easily serve as the sole source of protein in a person’s diet if that was necessary for some reason.

“Soybeans also contain haemagglutinin,” continue Fallon and Enig, “a clot-promoting substance that causes red blood cells to clump together. Trypsin inhibitors and haemagglutinin are growth inhibitors… Soy also contains goitrogens — substances that depress thyroid function.” It is true that soybeans contain these substances. How then do we explain that moderate amounts of soyfoods have been eaten happily by entire civilizations for thousands of years? Fallon and Enig’s case is built on animal studies in which test animals fed extremely large and unnatural amounts of soy containing these substances “failed to grow normally,” and developed “pathological conditions of the pancreas, including cancer.” But the fact is there is little to no evidence that the quantities of these substances found in a typical diet including soybeans would represent a health danger to humans.

Animal Studies

Animal studies are at the very foundation of many of the accusations against soy. But humans are different from any other animal, so foods that affect them in one way may well affect us differently. Protease inhibitors are substances that retard the action of digestive enzymes that cause the breakdown of protein. Fallon and Enig refer to studies that show that protease inhibitors isolated from soybeans can cause cancer in some animal species, but there is no evidence even suggesting that they have the same effect in humans. In fact, protease inhibitors found in soybeans have been shown to reduce the incidence of colon, prostate and breast cancer in humans.

Fallon and Enig make much of a 1985 study, which showed that soy increases the risk of pancreatic cancer in rats. But researchers with the National Cancer Institute point out that the pancreas of a few species of animals, notably rats and chicks, are extraordinarily sensitive to dietary protease inhibitors such as those found in soy. This sensitivity has not been found in other species such as hamsters, mice, dogs, pigs, and monkeys, they say, and is “not expected to occur in humans.” In fact, while rats fed nothing but soy run higher risks of pancreatic cancer, human populations consuming high levels of soy have decreased rates of pancreatic cancer. Species, even those that seem quite closely related, often function quite differently at a molecular level. It is true, as Fallon and Enig point out, that baby rats fail to thrive on soy. But they also fail to thrive on human breast milk. This is because rats and humans have vastly different nutritional requirements. Human milk, for example, is 5% protein; rats’ milk is 45% protein. The difference in nutritional requirements and responses for different species can be enormous. Foods that are highly nutritious for one species are often inedible or even poisonous to other species.

Soybeans are high in isoflavones — phytoestrogens, or plant substances that behave like weak forms of the hormone estrogen. Fallon and Enig select a few animal studies that appear to show a correlation between soy isoflavone consumption and cancer risk. But soy consumption has been repeatedly found to lower breast cancer risk in humans, precisely because of the isoflavones in soy.

Why the difference? K. O. Kline, M.D., of the Department of Clinical Science at duPont Hospital for Children in Delaware comments in a 1998 article in Nutrition Reviews. “It is clear from the literature,” writes Kline, “that different species and different tissues are affected by (soy) isoflavones in markedly different ways.” Fallon and Enig, however, do not agree. They denounce Kline’s comments, fuming that “this is scientific double talk.” Another interpretation would be that Kline is simply acknowledging the reality that there are physiological differences between species that must be taken into account.

Remember thalidomide, the drug that caused horrendous birth defects in children born to mothers who took the drug during their pregnancies? Thalidomide had been widely tested on animals, where it appeared to be totally safe. Similarly, the combination of fenfluramine and dexfenfluramine, recently touted to be the answer to dieters’ prayers, was extensively tested on animals and found to be very safe. Unfortunately it caused heart value abnormalities in humans. When the arthritis drug Opren was tested on monkeys, no problems were found, but it killed 61 people before it was withdrawn. Cylert was fine for animals, but when it was given to hyperactive children it caused liver failure.

Soy and Cancer: What is the Connection?

The important question, then, is what is the relationship between soy consumption and cancer in humans? Despite the allegations of those wishing to build a case against soy, the evidence strongly suggests not only that soy does not promote cancer, but that it reduces cancer risk.

For example, the elders of Okinawa have repeatedly been shown to be healthiest and longest-lived people in the world.   This was demonstrated conclusively in the renowned Okinawa Centenarian Study, a 25-year study sponsored by the Japanese Ministry of Health.

The researchers conducting the study analyzed the diet and health profiles of Okinawan elders, and compared them to other elder populations throughout the world. They concluded that high soy consumption is one of the main reasons that Okinawans are at extremely low risk for hormone-dependent cancers, including cancers of the breast, prostate, ovaries and colon. Compared to North Americans, they have a staggering 80 percent less breast cancer and prostate cancer, and less than half the ovarian cancer and colon cancer.

This enormously reduced cancer risk arises in part, the study’s authors say, from the Okinawans large consumption of isoflavones from soy. This is an important finding. The lowest cancer rates in the world are found in the Okinawans who consume the most soy.

Other studies have confirmed the link between soy consumption and reduced cancer risk. The Japan Public Health Center Study found the lowest breast cancer rates in those prefectures where women ate the most soy products. A recent study published in the British medical journal Lancet showed that women who ate the most flavonoids (mostly isoflavones from soy products) had a substantially lower risk of breast cancer than those who had lower flavonoid intake.

Perhaps most tellingly, a huge study published in the Journal of the National Cancer Institute in 2003 found that women with a high intake of soy reduced their risk of breast cancer by 54 percent compared to women with a low intake of soy.

The anti-soy campaigners repeatedly say that soyfoods raise the risk of cancer. But such charges are utterly incompatible with the findings of the prestigious Health Professionals Follow-up Study, which found a 70% reduction in prostate cancer for men who consume soymilk daily.

Kaayla Daniel is a protege of Fallon and Enig and the author of a prominent anti-soy book, titled The Whole Soy Story: The Dark Side of America’s Favorite Health Food. The book is edited by Fallon, who owns the small book company that publishes it. In her book, Daniel says that “soy can almost certainly be blamed for at least some of the increase in thyroid cancers in that soy isoflavones [the type of phytoestrogen found in soy] induce… thyroid tumors.” But that’s not what the Cancer Prevention Institute of California found when it undertook the Bay Area Thyroid Cancer Study. Quite the contrary. They found that those who consumed the most phytoestrogens from soy foods, whole grains, nuts and seeds, had a markedly lower risk of thyroid cancer. Women who consumed the most soy had about half the risk of thyroid cancer compared to those who consumed the least.

It is true that if you eat too much soy and your diet is deficient in iodine, your thyroid gland may become swollen and underactive, you may develop symptoms of hypothyroidism (such as lethargy and depression), and your risk of thyroid cancer could increase. But the answer isn’t to avoid soy. It’s to make sure you consume enough iodine. Soy does not cause thyroid problems in people who consume adequate amounts of iodine.

In the U.S., iodine deficiency is very rare, because common table salt is fortified with iodine, and a mere quarter teaspoon of iodized salt provides the needed daily dose. Those not consuming iodized salt, however, should make sure they are obtaining reliable sources of the mineral. The iodine content of plant foods depends greatly on the amounts found in the soil in which they are grown. Sea vegetables and seaweeds are excellent and reliable sources of the mineral, and most multi-vitamin supplements contain iodine.

Meanwhile, Kaayla Daniel’s book has misled many health conscious people into believing that soy increases the risk not only for thyroid problems and thyroid cancer, but for many other forms of cancer. As a result, increasing numbers of people have become frightened of eating soy.

Health researcher Syd Baumel was one of the first to challenge the promotion of soy as a miracle food, and to question the idea that the more soy you eat the better. But when he looked into Daniel’s claims, he was anything but impressed. He says Daniel’s book “consistently deceives and manipulates the reader in order to build a false case… Pretty well anywhere you dip into this book, the waters are muddied with half-truths, misrepresentations, errors, lies and other tricks of false persuasion.” Baumel gives this example:

“Daniel cites as five-year clinical trial in which six out of 179 post-menopausal women taking a very high dosage soy isoflavone supplement developed endometrial hyperplasia. None of the 197 women who took a placebo did. ‘Endometrial proliferation is a precursor of cancer,’ Daniel warns, implying the women can look forward to a date with the oncologist. She doesn’t mention that all of them developed the relatively benign, non-atypical form of endometrial hyperplasia. Research suggests this condition carries a 2 percent risk of progressing to endometrial cancer – little different from the 1 to 2 percent risk for women in general.”

In 1997, the American Institute for Cancer Research, in collaboration with its international affiliate, the World Cancer Research Fund, issued a major international report, Food, Nutrition and the Prevention of Cancer: A Global Perspective. This report analyzed more than 4,500 research studies, and its production involved the participation of more than 120 contributors and peer reviewers, including participants from the World Health Organization, the Food and Agriculture Organization of the United Nations, the International Agency on Research in Cancer, and the U.S. National Cancer Institute. In 2000, Riva Bitrum, the President of Research for the American Institute for Cancer Research, said that “Studies showing consistently that just one serving a day of soyfoods contributes to a reduction in cancer risk are encouraging.”

Of course, any foods with such potent biological properties — even healthful ones — are bound to have some unwanted side effects in some people under some circumstances. Although soy consumption on the whole reduces cancer incidence, there are questions about its effect on women who have estrogen-positive (ER+) breast tumors. These tumors are stimulated by estrogen. Might they therefore be stimulated by the weak estrogenic activity of the isoflavones found in soy? The jury is still out. There is some evidence this may be the case, though there is also evidence that soy consumption favorably alters the metabolism of estrogen so that it is less likely to stimulate tumor growth.   For healthy women, according to the American Institute for Cancer Research, “even two or three servings a day of soyfoods should be fine as one part of a mostly plant-based diet.”

Soy supplements are a different story. Soy pills and powders can contain amounts of isoflavones (usually daidzein and genistein) far in excess of the amounts possible to get through diet. Very little research has been done on the effects of such mega-doses. Although there is no firm evidence to demonstrate that ingestion of isoflavones has adverse effects on human beings, there is also no clear evidence that large doses are safe. Some manufacturers of soy protein isolates and supplements recommend that people consume 100 grams of soy protein a day (the equivalent of 7 or 8 soyburgers). I believe it’s probably safer, until more is learned, to avoid concentrated soy supplements entirely.

Does Soy Inhibit Mineral Absorption?

Fallon and Enig are adamant in their beef with soy, however, and their indictment of the bean continues. They fault soy for its phytic acid content. “Soybeans are high in phytic acid,” they say, “a substance that can block the uptake of essential minerals — calcium, magnesium, copper, iron and especially zinc in the intestinal tract… Vegetarians who consume tofu as a substitute for meat and dairy products risk severe mineral deficiencies.”

It is true that soybeans are high in phytates, as are many plant foods such as other beans, grains, nuts and seeds, and it is true that phytates can block the uptake of essential minerals, and particularly zinc. This would be a problem if a person consumed enormous amounts of soy. But the phytic acid levels found in a plant-strong diet including as much as three servings of soy a day are not high enough to cause mineral absorption problems for most people. Furthermore, when soy products are fermented — as they are in tempeh, miso, and many other soyfoods — phytate levels are reduced to about a third their initial level. Other methods of soy preparation such as soaking, roasting and sprouting also significantly reduce phytate content.

While phytates can compromise mineral absorption to some degree, there is absolutely no reliable evidence that vegetarians who eat soyfoods “risk severe mineral deficiencies.” Even the National Cattlemen’s Beef Association has acknowledged the nutritional adequacy of meatless diets. In an official statement, these representatives of the beef industry declared, “Well planned vegetarian diets can meet dietary recommendations for essential nutrients.”

Let’s look, one by one, at the minerals Fallon and Enig claim to be lacking for those who consume tofu rather than meat:

* Zinc: It is wise for vegetarians to include plenty of zinc-rich foods in their diets, but the levels of zinc found in the hair, saliva, and blood of vegetarians are typically in the normal range. Zinc deficiency would be particularly harmful in pregnant women, but studies of pregnant women have consistently found no difference in zinc status between vegetarians and nonvegetarians.

* Iron: Plant-strong diets are much higher in vitamin C, and vitamin C greatly enhances iron absorption, so even without eating red meat (which is high in iron), and even with the reduction in iron absorption from phytates, vegetarians are no more prone to iron deficiency than are nonvegetarians.

* Copper: Vegetarian diets tend to be higher in copper, which overrides any reduced rate of absorption from phytates. Vegans, in particular, consume considerably more copper than meat-eaters.

* Magnesium: Although the higher phytate content of soybeans and grains slightly reduces magnesium absorption, vegetarian diets are typically so much higher in this crucial mineral that vegetarians consistently show markedly higher serum magnesium levels than do nonvegetarians.

* Calcium: Calcium from soy is nearly as bioavailable as calcium from cow’s milk. Many studies have found a correlation between the consumption of isoflavones from soyfoods and increased bone health.

Soy Foods and Bone Health

Without providing any supporting evidence, Fallon and Enig go on to say that “soyfoods block calcium and cause vitamin D deficiencies… The reason that Westerners have such high rates of osteoporosis is because they have substituted soy oil for butter, which is a traditional source of vitamin D…needed for calcium absorption.”

Vitamin D is indeed needed for calcium absorption, and is crucial to human health in many other ways. But skin exposure to sunlight, not butter consumption, has always been the primary source of vitamin D in humans. In fact, people whose skin is not exposed to direct sunlight have difficulty getting enough vitamin D from their diets without supplementation. A 1999 report in the American Journal of Clinical Nutrition said that blood levels of vitamin D in sunlight-deficient people don’t begin to rise until 4,000 units of vitamin D are consumed. Someone relying on unfortified butter for this amount would have to eat four pounds of butter a day.

Why, then, do Westerners have such high rates of osteoporosis? We have become sedentary, plus we consume a highly processed, high-salt, high-animal protein diet.

The calcium-losing effect of animal protein on the human body is not a matter of controversy in scientific circles. Researchers who conducted a recent survey of diet and hip fractures in 33 countries said they found “an absolutely phenomenal correlation” between the percentage of plant foods in people’s diets, and the strength of their bones. The more plant foods people eat (particularly fruits and vegetables), the stronger their bones, and the fewer fractures they experience. The more animal foods people eat, on the other hand, the weaker their bones and the more fractures they experience.

Similarly, in January 2001, the American Journal of Clinical Nutrition published a study that reported a dramatic correlation between the ratio of animal to vegetable protein in the diets of elderly women and their rate of bone loss. In this seven-year study funded by the National Institutes of Health, more than 1,000 women, ages 65 to 80, were grouped into three categories: those with a high ratio of animal to vegetable protein, a middle range, and a low range. The women in the high ratio category had three times the rate of bone loss as the women in the low group, and nearly four times the rate of hip fractures.

Might this have been due to other factors than the ratio of animal to vegetable protein? According to the study’s lead author, Deborah Sellmeyer, M.D., Director of the Bone Density Clinic at the University of California, San Francisco, Medical Center, researchers found this to be true even after adjusting for age, weight, estrogen use, tobacco use, exercise, calcium intake, and total protein intake. “We adjusted for all the things that could have had an impact on the relationship of high animal protein intake to bone loss and hip fractures,” Sellmeyer said. “But we found the relationship was still there.”

Does Soy Protect Against Heart Disease?

If the articles written and spawned by Fallon and Enig were to be believed, just about everything we’ve been taught to believe about soy’s benefits is completely backwards. What about soy’s vaunted reputation (and FDA approval) for bringing down cholesterol levels? “For most of us,” say Fallon and Enig, “giving up steak and eating veggieburgers instead will not bring down blood cholesterol levels.”

Someone once said that people are entitled to their own opinions, but not to their own facts. A review of 38 studies, published in the New England Journal of Medicine in 1995, found that soy consumption reduced cholesterol levels in 89 percent of the studies.

If there is a grain of truth in Fallon and Enig’s statement, it is that while soy consumption tends to bring down total cholesterol levels most in people whose cholesterol levels are high, the results are less dramatic in those with healthier levels. But even people with normal levels benefit from eating more soy, according to dozens of studies, because it improves the ratio between HDL (good) and LDL (bad) cholesterol. This ratio is now recognized by the American Heart Association to be an even more important factor than total cholesterol levels in heart disease risk.

In 2000, the Nutrition Committee of the American Heart Association published a major statement in the peer-reviewed journal Circulation, officially recommending the inclusion of 25 grams or more of soy protein, with its associated phytochemicals intact (i.e., not in the form of an isolated soy protein supplement), in the daily diet as a means of promoting heart health. This recommendation is consistent with the FDA’s ruling allowing soy protein products to carry the health claim: “25 grams/day of soy protein, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease.”

What do the soy pooh pooh-ers say to this? They say that lowered cholesterol levels, even those lowered by diet, are dangerous: “The truth is that cholesterol is your best friend,” they write. “When cholesterol levels in the blood are high, it’s because the body needs cholesterol… There is no greater risk of heart disease at cholesterol levels of 300 than at 180.”

That’s quite a point of view, ignoring as it does just about everything that has been learned about heart disease and cholesterol in the past 30 years of medical science. The Lipid Research Clinics Coronary Primary Prevention Trial, for example, is considered the broadest and most expensive research project in medical history. Sponsored by the federal government, it took over ten years of systematic research, and cost over $150,000,000. George Lundberg, M.D., the editor of the Journal of the American Medical Association, where the gargantuan study was first published, said that the study proved that even small changes in our blood cholesterol levels produce dramatic changes in heart disease rates. Charles Glueck, M.D., director of the University of Cincinnati Lipid Research Center, one of the twelve major centers participating in the project, noted: “ For every one percent reduction in total blood cholesterol level, there is a two percent reduction of heart disease risk.”

Does Soy Cause Birth Defects?

One of the most alarming allegations that Fallon and Enig and other anti-soy campaigners make is that, due to the phytoestrogens in soyfoods, vegetarian diets promote birth defects. They repeatedly refer to a study published in the British Journal of Urology that found baby boys born to vegetarian mothers were five times more likely to suffer from hypospadias, a malformation of the penis correctable with surgery. I find this disturbing, but I know of no other study that links vegetarian diets with a higher rate of any birth defect, including hypospadias, and there are a number that show the opposite — lower rates of a variety of birth defects in babies born to vegetarian mothers. If the findings of this study were valid, however, it would be extremely important.

We certainly need more studies to determine what is going on, but after reading the actual study I am not nearly as concerned as I was upon reading Fallon and Enig’s description, because what they neglect to mention is the significant fact that the total number of baby boys in the study born with this condition to vegetarian mothers was only seven.

It’s hard to know just what to make of this small and isolated study. To my eyes, it highlights how much we have yet to learn about the impact of the phytoestrogens contained in soy. Given our current state of knowledge, I think that pregnant women should largely avoid soy-based supplements. But there is no cause to conclude that vegetarian diets, or soyfoods, are suspect in pregnancy.

Vegetarian diets have consistently shown profound benefits for pregnancy and lactation, including much lower levels of the toxic chemicals that typically concentrate higher on the food chain in meat, fish and dairy products. A report in the New England Journal of Medicine on the levels of contamination in human breastmilk found that vegan mothers had dramatically lower levels of toxic chemicals in their milk compared to mothers in the general population. The highest level seen among these vegan mothers was actually lower than the lowest level seen in nonvegetarian mothers. In fact, the levels of contamination found in the milk of the vegetarian mothers was only 1 to 2 percent as great as the level found in the milk of nonvegetarians.

Infant Soy Formulas: Birth Control Pills for Babies?

Another of the disturbing charges made by the soy bashers is the allegation that “an infant exclusively fed soy formula receives the estrogenic equivalent (based on body weight) of at least five birth control pills per day.” Soy formula, say Fallon and Enig, amounts to “birth control pills for babies.”

In my view, there could be some basis here for concern. For an adult to regularly eat soy characteristically produces a reduced risk of developing breast or prostate cancer. But the same phytoestrogens that produce this effect in adults may produce very different effects in infants. “With adults, half their phytoestrogens are freed into the bloodstream to bind to estrogen receptors, which helps to fight breast cancer,” explains Patricia Bertron, dietitian director of the Physicians Committee for Responsible Medicine. “But with infants, less than five percent are available to bind to receptors.” There is a possibility that this could pose a risk to the sexual development of infants and children. Because the milk source makes up nearly the entire diet of infants, babies fed soy formulas may be at increased risk of harm.

These theoretical risks are quite disturbing, but they appear at this point to be merely theoretical, because we have yet to see any substantive evidence of this harm in people. There have been no reports of hormonal abnormalities in people who were fed soy formula as infants — and this includes millions of people in the past 30 years. In fact a major study published in the August, 2001, Journal of the American Medical Association found that infants fed soy formula grow to be just as healthy as those raised on cow’s milk formulas. If the phytoestrogens in soy were affecting the reproductive system of infants fed soy formulas, then soy-fed babies would develop reproductive health problems as adults. The study evaluated 811 men and women between the ages of 20 and 34 who had participated in soy and cow’s milk studies as infants. No significant differences were found between the groups in more than 30 health areas. The only exception was that women who had been soy-fed reported slightly longer menstrual periods (one-third of a day) than women raised on cow’s milk formulas.

The debate as to which is better, formulas based on soy or cow’s milk, is unresolved. Each seems to have its own dangers. What is indisputable is that babies reared on breastmilk have phenomenal health advantages over babies reared on any type of formula.

Compared to babies who are fed soy or cow’s milk based formulas, babies who are beast-fed for at least six months have:

    • Three times fewer ear infections
    • Five times fewer urinary tract infections
    • Five times fewer serious illnesses of all kinds
    • Seven times fewer allergies, and are
    • Fourteen times less likely to be hospitalized.

    The health advantages of breastfeeding are almost impossible to exaggerate. Babies who are breast-fed:

    • Spit up less often
    • Have less diarrhea
    • Have less constipation
    • Are 30 times less likely to die from Sudden Infant Death Syndrome
    • Are only half as likely to develop diabetes
    • Half an average I.Q. seven points higher

    The health benefits of breastfeeding are lifelong. As adults, people who were breast-fed:

    • Have less asthma
    • Have fewer allergies
    • Have less diabetes
    • Have fewer skin problems including dermatitis
    • Have lower risks of heart attacks and stroke
    • Have lower cholesterol levels
    • Have less ulcerative colitis (ulcers in the large intestines)
    • Have less Crohn’s disease, and
    • Have protection from certain chronic liver diseases.

    The evidence that breast is best is utterly overwhelming. Yet the anti-soy crusader Sally Fallon would evidently prefer that an infant be fed a cow’s milk formula rather than breast milk, if the mother is a vegetarian. She writes that “breast milk is best if the mother has consumed a …diet…rich in animal proteins and fat throughout her pregnancy and continues to do so while nursing her child.”

    Why would someone make a statement like that? Where are these soy antagonists coming from? What are they trying to prove?

    Fallon and Enig, like Kaayla Daniel and many of the other headliners in the anti-soy campaign, are proponents of the philosophy that in order to be healthy people must eat large amounts of saturated fat from animal products. They advocate feeding pureed meat to infants. And they deplore the fact that soy products are increasingly replacing animal products in the American diet.

    Cow’s Milk vs. Soy Milk

    Some anti-soy crusaders, most notably the U.S. dairy industry, clearly have a financial agenda. In recent years, the dairy industry has been waging war particularly against soymilk. They have attempted to keep soy beverages from being included in the milk group in the Dietary Guidelines for Americans. They have sued the manufacturers of soy beverages for using the word milk, claiming that the dairy industry alone has a right to use the term. And they have tried to keep soy beverages from being sold alongside cow’s milk in the grocery aisles. A spokesperson for the National Milk Producers Federation made it clear why the industry was upset. “It is,” he said, “a clear attempt to compete with dairy products.”

    Heaven forbid.

    Meanwhile, the dairy industry has been spending hundreds of millions of dollars on ads and other forms of promotion trying to convince the public that cow’s milk is vastly preferable to soymilk. For example, the Dairy Bureau tell us that…. “Unfortified soy beverages contain only half of the phosphorus, 40 percent of the riboflavin, 10 percent of the vitamin A, (and) 3 percent of the calcium . . . found in a serving of cow’s milk.”

    Let’s look at the Dairy Bureau’s claims carefully for a moment.

    * Only half the phosphorus? That sounds bad. But we actually get plenty of phosphorus in our diets, and possibly even too much. Providing only half the phosphorus of cow’s milk is an advantage, says dietician Brenda Davis, not a disadvantage.

    * Only 40 percent of the riboflavin? It’s true that unfortified soymilks contain only about half as much of this nutrient, also known as Vitamin B2, as cow’s milk. But riboflavin is plentiful in nutritional yeast and green leafy vegetables, and is found in nuts, seeds, whole grains, and legumes, so getting enough riboflavin isn’t a problem for people who eat a variety of healthy foods. In fact, vegans (who consume no dairy products) consume as much, or nearly as much, of this vitamin as lacto-ovo vegetarians and non-vegetarians. A mere teaspoon of Red Star Nutritional Yeast powder contains as much riboflavin (1.6 mg) as an entire quart of cow’s milk.

    * Only 10 percent of the vitamin A? Vitamin A is plentiful in plant-based diets. We don’t need milk to get sufficient amounts of this nutrient. In fact, vitamin A deficiency is quite rare among North Americans and Europeans who eat plant-based diets. Furthermore, vitamin A is high in cow’s milk only because it’s added to it, and there is no reason it could not be added to non-dairy beverages if there was some advantage to doing so.

    * Only 3 percent of the calcium provided by cow’s milk? Where does the dairy industry come up with this stuff? All of the most popular soy beverages sold in the United States provide vastly more calcium than the 3 percent claimed by the Dairy Bureau. Most enriched versions provide 100 percent as much. Even those soy beverages that have not been enriched provide two to nine times as much calcium as claimed by the Dairy Bureau.

    Meanwhile, there are a few more things the dairy industry isn’t telling you about the nutritional comparison between cow’s milk and soymilk that you might want to keep in mind. For example:

    * Cow’s milk provides more than nine times as much saturated fat as soy beverages, which many researchers believe could make it more likely to contribute to heart disease.

    * Soy beverages are cholesterol-free, while cow’s milk contains 34 mg of cholesterol per cup.

    * Soy beverages lower both total and LDL (“bad”) cholesterol levels, while cow’s milk raises both total and LDL cholesterol levels.

    * Soy beverages contain numerous protective phytochemicals that may protect against diseases such as heart disease, cancer, and osteoporosis. Cow’s milk contains no phytochemicals.


    Still, there are legitimate questions about soy. To my mind by far the most disturbing stems from the fact that 90 percent of the U.S. soybean crop today is genetically engineered. These are beans that have been genetically altered to enable the growing plants to withstand being sprayed with Monsanto’s Roundup weedkiller. Because so much Roundup is used on these crops, the residue levels in the harvested crops greatly exceed what until very recently was the allowable legal limit. For the technology to be commercially viable, the FDA had to triple the residues of Roundup’s active ingredients that can remain on the crop. Many scientists have protested that permitting increased residues to enable a company’s success reflects an attitude in which corporate interests are given higher priority than public safety, but the increased levels have remained in force.

    While Roundup has been shown to cause reproductive disorders and birth defects in a large number of animal studies, its impact on humans is far less understood. But a laboratory study done in France in 2005 found that Roundup caused the death of human placental cells. And a 2009 study found that Roundup caused total cell death in human umbilical, embryonic and placental cells within 24 hours.

    It’s hard to avoid the suspicion that eating genetically engineered soybeans could pose serious health risks to people. In 2011, the Los Angeles Times published an exposé revealing that prior to being granted FDA approval, Monsanto’s own research had raised many questions about the safety of their Roundup Ready soybeans. Remarkably, the FDA did not call for more testing before allowing these soybeans to flood the marketplace. Since 90 percent of the soybeans grown in the United States are now Monsanto’s Roundup Ready variety, and because soy is contained in such a wide array of processed foods, tens of millions of people are unknowingly eating these inadequately researched foods daily. It’s a mass experiment, except that there is no control group, data is not being systematically collected, and virtually the entire human population are the guinea pigs.

    According to Monsanto’s own tests, Roundup Ready soybeans contain 29 percent less of the brain nutrient choline, and 27 percent more trypsin inhibitor, the potential allergen that interferes with protein digestion, than normal soybeans. Soy products are often prescribed and consumed for their phytoestrogen content, but according to the company’s tests, the genetically altered soybeans have lower levels of phenylalanine, an essential amino acid that affects levels of phytoestrogens. And levels of lectins, which are most likely the culprit in soy allergies, are nearly double in the transgenic variety.

    Compared to regular soybeans, the genetically engineered beans have more of the very things that are problematic, and less of the very things that are beneficial. As well, there is growing evidence that Roundup Ready soybeans disrupt the bacterial milieu of the human gastrointestinal tract.In 2011, one of the nation’s senior scientists, Dr. Don Huber, professor emeritus at Purdue University, informed Secretary of Agriculture Tom Vilsack of a dire new development. A new pathogen had been discovered that may already be doing irreparable harm to both plants and animals. Dr. Huber pleaded with Vilsack to understand that…

    “It is widespread, very serious, and is in much higher concentrations in Roundup Ready soybeans and corn… This could result in a collapse of US soy and corn export markets and significant disruption of domestic food and feed supplies… For the past 40 years, I have been a scientist in the professional and military agencies that evaluate and prepare for natural and manmade biological threats, including germ warfare and disease outbreaks. Based on this experience, I believe the threat we are facing from this pathogen is unique and of a high risk status. In layman’s terms, it… is an emergency.”

    Recognizing that virtually all U.S. beef cattle, dairy cows and pigs are fed Roundup Ready soy, Huber went on to write:

    “The pathogen may explain the escalating frequency of infertility and spontaneous abortions over the past few years in US cattle, dairy, swine, and horse operations. These include recent reports of infertility rates in dairy heifers of over 20%, and spontaneous abortions in cattle as high as 45%…

    “It is well-documented that [Roundup’s primary active ingredient] glyphosate promotes soil pathogens and is already implicated with the increase of more than 40 plant diseases; it dismantles plant defenses by chelating vital nutrients; and it reduces the bioavailability of nutrients in feed, which in turn can cause animal disorders…

    “I have studied plant pathogens for more than 50 years. We are now seeing an unprecedented trend of increasing plant and animal diseases and disorders. This pathogen may be instrumental to understanding and solving this problem. It deserves immediate attention with significant resources to avoid a general collapse of our critical agricultural infrastructure.”

    There is a very real danger taking place in the world of soy, but it is not what the anti-soy brigade would have us believe. While they have been misleading the public, saying that soy foods are hazardous to human health, they have been missing the real danger. Monsanto’s Roundup Ready soybeans now represent almost the entire U.S. soy crop.

    Here is one of the strongest arguments ever made for organic foods: The only way to insure that the soy foods you eat are not Roundup Ready is to be sure that they are organically grown.

    Should We Eat Soy At All?

    While soy foods have much to offer, they have certainly been at times heavily over-promoted. As a result, some people have gathered the impression that as long as they eat enough soy, they don’t have to worry about the rest of their diet and lifestyle. This is a dangerous and mistaken belief. Just as taking vitamins can’t atone for a poor diet, consuming soy can’t make up for a diet that’s otherwise poor. Nor can it compensate for a lack of exercise, or other destructive lifestyle habits.

    The hype has also made us forget something important. We are eating soy products today at levels never before seen in history. Advances in food technology have made it possible to isolate soy proteins, isoflavones, and other substances found in the bean, and add them to all kinds of foods where they’ve never been before. The number of processed and manufactured foods that contain soy ingredients today is astounding. It can be hard to find foods that don’t contain soy flour, soy oil, lecithin (extracted from soy oil and used as an emulsifier in high-fat products), soy protein isolates and concentrates, textured vegetable protein (TVP), hydrolyzed vegetable protein (usually made from soy) or unidentified vegetable oils. Most of what is labeled “vegetable oil” in the U.S. is actually soy oil. And most of our soy products are now genetically engineered.

    This has never before been done in human history. It is an experiment, and should be undertaken, if at all, with great humility, watchfulness, and caution. Instead, under the influence of an almost mystical belief in soy’s virtues, we’ve tended to fall prey to an illusion that has haunted American culture in all kinds of ways — the illusion that if a little is good, then surely more must be better.

    The anti-soy crusaders, on the other hand, tell us that any amount of soy is too much. They are correct that there are substances in soy that if eaten in too high a concentration can cause problems. The reality, though, is that this is true of almost all foods. In fact, if you made it your policy to eat no food that contained substances which can in large enough concentrations cause damage, there would be literally nothing left for you to eat.

    It’s true that soybeans contain substances that in excess can be harmful. But to imply, as some do, that eating soy foods poses a risk to human health is twisting and distorting the evidence. There would be dangers in eating a diet based entirely on soybeans. But, then, the same could be said for broccoli or any other healthy food. This is one of the reasons why varied diets are so important. Diversity protects. For most people under most circumstances, soy products are a healthful addition to a balanced diet that includes plenty of vegetables, whole grains, seeds, nuts, fruits, and other legumes. For most people, substituting soy foods for some of the animal foods they now eat is one of the healthiest dietary changes they could make.

    In my view, the best way to take advantage of soy’s health benefits is to follow the example of the traditional Asian diets. As a population, these are cultures that, when they have eaten their traditional diets, have tended to be healthier and live longer than Americans. The Okinawa Japanese, the longest living people in the world, average 1-2 servings of soy each day. They have traditionally eaten regular but moderate amounts of whole soy foods such as tofu, soymilk, and edamame, as well as the fermented versions, tamari, and miso. These are the soy foods that I prefer to eat — rather than the soy products made with soy protein isolates, soy protein concentrates, hydrolyzed soy protein, partially hydrogenated soy oil, etc. Whole soy foods are more natural, and are the soy foods that have nourished entire civilizations for centuries.

    For me, the best of the bean includes foods like:

    * Tofu. The soaking process used traditionally to make tofu reduces the trypsin inhibitors and phytates. High in protein, tofu has a bland and neutral taste, and can be added to all kinds of foods. As with all soy products, get organic if you can.

    * Tempeh. Extremely high in protein and fiber, and produced in a way that greatly lowers trypsin inhibitors and phytates, tempeh is, from a nutritional perspective, an ideal way to eat soybeans. Most people feel it needs considerable seasoning to taste good.

    * Miso. Widely used as a salty condiment and a basis for soups, miso is a potent probiotic, containing many kinds of friendly bacteria that are beneficial to the intestinal tract. The fermentation process used to make miso deactivates the trypsin inhibitors and phytates.

    * Tamari (or Shoyu). This is a fermented soysauce that is very flavorful and salty.

    * Soymilk. Often called soy “beverages,” or soy “drinks,” because the dairy industry refuses to allow them to use the word “milk.” Trypsin inhibitors and phytates are low. I prefer the brands made with whole soybeans, and avoid those made with soy protein or soymilk powder. (There are also milks made from rice, almonds and oats that offer their own advantages to cow’s milk.)

    * Soy Nuts and Soy Nut Butter. These are particular favorites with many children. Roasting helps reduce phytate levels.

    * Edamame. This is a green vegetable soybean harvested while immature, so that the seeds fill 80% to 90% of the pod. Cooked for about 15 minutes in lightly salted boiling water, it’s served as a snack, mixed with vegetables, or added to salads or soups.

    * Soy ice creams (non-dairy frozen desserts). These may not technically belong on a list of the healthiest of ways to eat soy, but I must admit I’ve got a weakness for them. I eat the ones made with organic beans and/or organic soymilk, and not those (like Tofutti) made with soy proteins or soy protein isolates. (There are also frozen desserts made from coconut milk and other plant foods that also offer advantages to cow’s milk ice cream.)

    My conclusion: Genetically engineered soybeans present us with an historically unprecedented problem, and argue strongly for organics. Even if you eat only organically grown soy, becoming a soy-a-holic and automatically downing anything made from soybeans is not the road to health. But neither is shunning and stigmatizing soy foods.

    The anti-soy crusade has needlessly frightened many away from a food source that has long been a boon to humankind, a food source that can, if we are respectful of our bodies and of nature, nourish and bless us in countless ways.


  1. Thanks for a thorough, well-researched, balanced and reassuring assessment of soy foods – extremely valuable! I'm off to post it on my social networks right now.

  2. I didn't find an answer to my concern in this article. Soy contains a lot of estrogen – hence I'm not sure it's okay for males to eat a lot of soy… especially babies and kids.

  3. For those who think that soy is high in estrogen and unsafe for males, I'm a 53 year old male vegan, and my testosterone just tested at 1111 ng/dl. I eat a half a pound to a pound of organic tofu per day. Viva soy.

  4. What I extracted out of this is the mention too many times that " no one knows for sure"! If it is not good for babies to drink and girls are starting to menstruate at younger and younger ages some as early as 7 and many young women I know are having problems conceiving the argument starts to become nauseating to me. I prefer to err on the side of caution and avoid all soy unless it is fermented. For others I tell them to listen to their body after they eat it. Soy is an un-digestible protein for most people and many are allergic to it or have sensitivities. As we all know Dentists still say that silver fillings are OK too. All foods that are government subsidized are genetically modified: wheat, soy, corn and chances are even greater that the organic crops are being contaminated due to winds carrying the toxic seeds. I also don't trust any studies conducted by government agencies. They only tell us what they want us to know.

  5. I think your article can be parsed into oblivion in the same way you have done to Fallon and Enig. You cite research from organizations that are joined at the hip with Big Farma. In other words, these institutions are not interested in eliminating cancer–they all make fortunes from the public's misfortunes.

    And some of your data is questionable. When citing the connection betw soy eating and low cancer in Asian countries, you imply causation. One of the biggest things about Asian diets and cancer is seaweed! So here, too, we may see correlation, but not causation. The list can go on, but my point is made.

  6. Absolutely great article! At 63 – and a 5-time cancer survivor in the 80's – and predominantly vegan in my dietary approach, I eat some form of whole food soy daily. And have done for most of my adult life. From my standpoint it is just common sense. The healthiest people in the world eat soyfoods (natural, whole non-GMO sources) daily. Americans eat meat and dairy products and they're are fat and sick, and our young people are fat and dying from illnesses they should not be developing. So all of that anti-soy hogwash is just that! Hogwash! That said, fractionated anything is NOT WHOLE FOOD! And that includes all of the fractionated soy oils, the protein isolates, the soy protein concentrates, the hydrolyzed soy proteins, the soy supplements, etc. We have to stop allowing Big Agra and Big Pharma using us as guinea pigs for a mass suicidal experiment. We MUST start eating whole, non-GMO foods, including soyfoods, in moderation, and we will all be far healthier as a result! :-)

  7. "…food source that has long been a boon to humankind…"?
    Westerners have only been consuming soy for around 20-30 years – yes, the Okinawans DO consume soy, but they also eat much more fish an pork than soy along with seaweed and fresh vegetables. This page is food for thought, with many good points, but the soy industry is far bigger and more powerful than the pastured meat industry and so it's more likely that the author is in the pocket of big agra (Monsanto and their chums) than the possibility (implied here) that people like Sally Fallon are in the pocket of the meat industry (which Fallon despises by the way).

  8. Few Asians get as much soy in their diet as westerners do in packaged food these days. It's almost impossible to avoid it on the supermarket shelf. It's as insidious as High Fructose Corn Syrup. That's probably where it does the most damage. Your average hippie (the real ones or the scenester ones that 'play at hippiness' like it was a t-shirt) who throws soy milk in their chai and over their quinoa porridge is generally eating much better than your average Joe Shmoe with a lot of veggies and fruit, so his/her system is bound to be able to cope better with all the potential damage from the soy and grains they're also eating.

  9. Judy, that's kinda the point I was making. The only thing more absurd is his implication that Sally Fallon and co are somehow under the influence of 'big meat'.

    The thing is, anyone defending soy IS doing big agra a GREAT service. You can't buy local, environmentally raised soy (but you can buy grass-fed beef that bypasses the 'big-meat' system entirely). Soy is ubiquitous, unnecessary and utterly foreign to our bodies. If cattle fed soy and grains get sick and fat (and they do) then what do you think it's doing to us?

  10. "Don't eat anything what your great-grandma wouldn't have recognized as food," Michael Pollan advises ('t-eat-what-your-great-grandma-wouldn't-ate). In addition, great-grandma didn't know about an FDA which has not protected us from aspertame, GMOs, margarine with trans-fat-plant-statin combinations lowering cholesterol but not the numbers in heart disease…, and… also soy? It's worth to read through the Enig-Fallon-study – and thoughtfully build up one's own mind. However, some farmers in the neighbourhood still grow some nice heritage beans too, don't they? Consequently, we didn't have to wonder where all the putative organic soy for human consumption may come from.

  11. what an awesome article. soy is the perfect food one minute and the vile enemy the next this is well researched article.

  12. Fantastic article! Thanks for again calling attention to the uselessness of animal testing, particularly using unusually large amounts of the tested substance. I, thankfully, haven't paid too much attention to the anti-soy claims of recent years. Why? Because I feel so much better when consuming soy milk as opposed to cow's milk, and tofu compared with any animal protein. And as my grandmother always informed us, how we are feeling is generally a much better gauge of our health than all the tests, etc., in the world!

  13. You can buy local soy and soy products here, so I would assume you can almost anywhere as well – avoiding the industry you speak of. Of course, as a vegetarian like so many others, wouldn't touch the meat industry, pastured or not.

  14. Do you really think that soy is the culprit for early menstruation? How about cow's milk and all the hormones they are fed, gmo grain, etc. To me that is the reason.

  15. Listening to your body is the key! I listened to my body after using soy milk for several years.

    Since my foods were being bombarded with soy protein, soy flour, soy lecithin and soy beans, plus using only soy milk, my body finally said: "enough already"! I broke out in a horrible, red, itchy rash on my back, in my hair, rib area and insides of my forearms.

    After doing some investigating online, I found that this can be a reaction to too much soy. I have eliminated soy from my diet and the itchy rash has cleared up. As soon as I eat just a few items with any soy, I break out in the itchy rash. I'm thoroughly convinced that soy is not good for us!

    • Yes! I know what you mean! My husband and I both tested quite severe to soy sensitivity–and we barely ate soy except what is found in processed/packaged foods (this was before we went organic 6 years ago). I couldn't breastfeed, and my daughter developed a milk allergy so was put on soy formula. At the time (13 years ago), I wasn't enlightened about our food/nutrition/health system. I wasn't told about any other options–and I didn't know enough to even ask.

      Eating soy for us gives us gastro symptoms.

      I haven't tried anything like some of the fermented soy products. Just knowing that there is an issue for my family with soy is enough for us to stay as much away from it as we can. I definitely do NOT bring tofu into the house to use, and the years of drinking soy milk are gone. We use healthier alternatives now.

  16. I am so grateful for this article. It is highly timely the 'debunkers' be 'debunked'. Thank you for sharing and I will share generously!

  17. Thank you so much for this thorough examination of soy. I'm a huge fan of miso, and I cook with tofu or tempeh once or twice per week. As a vegan, I enjoy the incredible flexibility these foods allow in my recipe development. I've had people express concerns over consuming soy, so I'm excited to have a reliable, clear source to them to.

    Keep up the great work!

  18. Buying only organic soy – with "NON-GMO" clearly stamped on the label (there are many varieties like this) will eliminate the fear that the soy has been genetically modified, and you can be sure it is a healthful product – a great alternative to eating animal proteins.

  19. We are facing the compounding effects of eating GMO soy, corn and wheat in all of our packed foods as well as the GMO soy, corn and wheat being fed to the animals which we eat. It's in everything! To blame soy is to avoid the big picture – our entire food supply and our planet are being poisoned.

  20. After reading all these studies and listening to arguments pro and con just eat what the hell you want and stop worrying about dropping dead. When you croak you croak its just a life cycle.

    • Hi Bill. Some people don't just drop dead. They may suffer severe pain and discomfort before they die and it may be or may not be because of their lifestyle. Also, why give loved ones unnecessary pain with a premature death, especially one that by circumspect living might have been delayed?

  21. as always, it depends on who is doing the writing. I would rather believe this article, considering the source, than criticise him. We do believe what we want to believe in most all instances. Not many of us are technical research people. We are open to what people or organizations we respect have to say.

    Quite a hefty article to read, but it was interesting none the less. One thing that surprised me was that much of the soy is gmo.
    I want to know what is or isn't gmo, thus labeling is the crucial point to me rigfht now. We are in a group of people who want to make healthy choices for what we are putting in to our bodies. These articles do help.

    • The more of us who use our food money to support the food that are non-gmo certified the sooner that these large companies like Monsanto will go away.

      I may have a small food budget – but I will eat smaller quantities of quality foods than a larger amount of poisoned foods that are unhealthy for any one or thing.

  22. Thank you so much for this very balanced article, you have improved my education on this subject 100%, which, as someone who has been a vegan for two and a half years is so essential.Sadly the British government looks likely to go ahead with more G M testing in this country, which in light of your studies is a retrograde step.I shall take every opportunity to bring people's attention to your work.My thanks and best wishes from Gerry Manvell.

  23. You need to add a list of references that you cite in the article and that the authors who argue against you cite. Also, it would be good to find out the educational and professional background of those authors and of yourself.

  24. "All of the most popular soy beverages sold in the United States provide vastly more calcium than the 3 percent claimed by the Dairy Bureau. Most enriched versions provide 100 percent as much. Even those soy beverages that have not been enriched provide two to nine times as much calcium as claimed by the Dairy Bureau."

    The problem with fortified soy milk is that you don't know the sources of the additives. For unfortified soy milk, even at 9 times the three percent claimed by the Dairy Bureau, that's only 27% of the calcium in milk. I use Westsoy Organic Unsweetened Plain (Non-GMO Verified) soymilk. The only ingredients are filtered water and whole organic soybeans. To each serving, I add 1/4 teaspoon calcium carbonate powder to ensure I get enough calcium.

  25. Thanks for a really enlightening, very well-written and researched, and honest article. I am pleased to have so many of the soy questions raised and discussed in one place. Very helpful!

  26. Lori, did you read the article? thats not what it says…avoid non organic soy….avoid all gmo food get organic and eat soy just dont only eat soy…eat a wide variety of plant based foods.

  27. Has anyone here been to asia? They eat soy every day. I don't think anyone over there is dying faster, having more heart disease or menstruating earlier than any American. The common sense thing is that we need to eat whole foods that are non-gmo, non-preserved. That includes Soy. The problem in America is not soy or dairy or any other food. The problem is how the food is handled and processed. It's common sense, let's just go back to basic eating and cooking our whole food instead of trying the fast easy way to food.

  28. Thank you, John Robbins, for taking the time and energy to thoughtfully and carefully detail that info regarding soy! You are a blessing to humankind and I am so grateful for the work that you have done and that you exist on this planet! The statement just above the sub-heading "SOY FOODS AND BONE HEALTH" that the Calcium from soy is "almost as bioavailable as the calcium from cow's milk" I found alarming as it is my understanding that the calcium from cow's milk is almost completely LACKING IN BIOAVAILABILITY within the human digestive system. The CASEIN in cow's milk is of such a higher concentration and of such a different structure than the CASEIN in human milk that it acts like glue within the human intestine, preventing the nutrient of calcium to be absorbed.

  29. Because of the pros and cons on Soy…………I enjoyed this information provided!!
    I used to use Non GMO soy protein powder and switched to HEMP 70 protein powder. Thanks

  30. I am not convinced by your arguments for soy. Statistics, like accounts, can be cooked depending on what the researcher is trying to prove. Also, you guys are anti-meat (Diet for a New America) so I feel that you are arguing from that premise. For example you quote a study that says "women with a high intake of soy reduced their risk of breast cancer by 54 percent". How exactly did they get the 54% figure? How was it calculated if not by mathematical/statistical manipulation? I don't know if soy is good or bad but it's time some research methods were made more transparent (how do they calculate risk?) and it's time for writers to stop making blanket statements. I want vibrant health but I'm sick and tired of so many so-called experts giving conflicting statements.

    • I think there will always be different views on certain subjects, sometimes complementing each other and sometimes conflicting with each other. It is then left to the individual hearing or reading it to come to a conclusion based on their own life circumstances and experiences and what rings true to them.

    • The Harvad Institute of Medical Research annualy publishes food recommendations for the people of the US. They have always been favoring meat. For 3 years now they have to admit that a plant-based diet is healthier than a not plant-based diet, according to several clinical long-time studies, that have been quoted on their website.

  31. Unfortunately, all of the salty soy products, including soy sauce, tamari, liquid aminos, and miso, contain high levels of glutamate and are highly excitotoxic.

    You can hear neurosurgeon Russell Blaylock, author of "Excitotoxins: The Taste That Kills" discuss liquid aminos here: (scroll to 02:56)

    Or read about the topic here:

    WHOLE (unrefined, unprocessed) foods are what our digestive physiology was designed for, eons before food-manufacturing plants came into being. I personally eat NOTHING with a package or a label, preferring foods that still look like they did when they were growing in the ground. So until I chance across a tofu tree or a tempeh bush, or make soymilk MYSELF from fresh soybeans, I'd consider these to be recreational (non)foods at best.

  32. Thank you for taking the time to share so much valuable information about soy. I began feeding our family (with 3 children 15, 14 and 9 years of age) a whole foods, plant based diet almost 2 years ago. They have adjusted and continue to be healthier than their peers. The hardest time I have is with their grandparents trying to brainwash them that they need meat and cows milk. :( The way the US seems unable or unwilling to stand up to big Agriculture is so upsetting.
    Thank you!

  33. "Virtually all U.S. beef cattle, dairy cows and pigs are fed Roundup Ready soy." This is true and can be verified by those agricultural industries. It's unfortunate that many people who ingest *more* soy, indirectly, than do plant-based/vegan eaters try to discourage people from eating organic soy-derived foods that are healthful and healthier than the conventional animal-based protein sources known to increase risk of disease that also contain antibiotics, hormones, GMO and chemicals known to have toxic effects, over time, in people who eat them.

  34. Corporate America i gradually killing us all in the name of the blessed bottom line. That has become what America is all about Money and Greed so now we all suffer because of the wealthy few. Amazing!

    • There may be something to that bottom line statement. However, as long as we keep educating the public, and stop buying their unnatural, unhealthy garbage, and demand Organic, Non-GMO products, than where is the profit…. We can and must win….

  35. Thank heavens I consume waterwashed and non GMO soy protein from Shaklee Corporation. Dr. Shaklee knew how to process soy into a powder for all the health benefits of this amazing food. Reference to check the health of long term Shaklee supplement users (20 years of more) compared to others with multi's or no supplements at all. Prepare to be amazed! The Shaklee group took a soy supplement along with multiple natural food based supplements – the results are there for everyone to see.

  36. the biggest source of estrogen in the diet is cows milk… not just because of the added hormones, but because of how have been bred to produce higher milk yields as well… and not all government funded studies are bad… one has to look at the design of the studies and the weight of the research evidence.

  37. I think the key to this article lies in the fact that animals react differently to different foods. A test on a rat may be different than on a human. EXTRAORDINARILY AS IMPORTANT is the fact that EACH AND EVERY HUMAN IS DIFFERENT. Some people are fine with soy. When I eat soy, even organic cooked to eliminate any digestive inhibitors, I KNOW IT. My body just does not do well on it. So, there are some things you can say are bad for all humans. Cigarrettes, alchohol, drugs, etc. Then there are the things you JUST HAVE TO LISTEN to your body to know if it agrees with you. Unfortunately, the american diet (sugar and white flour) has effectively turned that listening switch off for a lot of people. This country needs a lot of work.

  38. Very helpful. As the author states, 90% of soy is genetically modified; I really wish that information had been at the beginning, rather than at the very end. Also the info about the FDA changing its standards for Roundup Ready. The info about soy isolates, TVP versus real soybeans was very useful.

  39. I didn’t find an answer to my concern in this article. Soy contains a lot of estrogen – hence I’m not sure it’s okay for males to eat a lot of soy… especially babies and kids.

  40. What a crock. Soy is poison, not fit for animal or human consumption. You're just covering up the truth. I'm unsubscribing.

  41. I dispise GM anything. Sadly, Congress has blessed this monopoloy and most of us have to buy what's on the market. However, saying that I'm 82 and as a vegan have been eating soy products since '83. I don't use prescription drugs and I stay away from doctors because happily so far I don't need them. I don't think too many people can beat this testimonial.

  42. Thanks so much, John, for this timely article and for helping to keep perspective. References would be great and helpful for further study, and adds credibility. Great article – interesting that an industry (ie: dairy/beef) that refutes the benefits of soy for people, would find it so beneficial for their stock! Hmmmm, am I the only one to see the irony in this? lol. We are very lucky that in NZ most of our cattle are grass fed, but we are now starting to import grains to feed during drought or other difficulties (crazy – we always managed before) and is testament to the fact that our consumption of dairy and meat products is not sustainable for us or the planet. Michael Pollan's words of wisdom – "eat food, not too much, mainly plants" – insanely simple :-)

  43. Good alert on GMO effects but I was reading along considering your points, wishing for footnotes on the studies plus info on who paid for each one, when one statement stopped me short. From the quote "breast milk is best if the mother has consumed a diet rich in animal proteins…" you stated Sally Fallon would " evidently prefer that any infant be fed cow's milk formula than breast milk if the mother is vegetarian." That shows either a hateful personal attack or an ignorance of what she is about. She did not and never would prefer such!
    Other things that bothered me: following the above directly with the anti-soy dairy propaganda as if Sally were part of it when she is also attacked by the dairy industry, promotion of many highly processed soy items, suggestions of adding isolated vitamins to enrich products, assuming the government or industry research to be useful when it supports anything vegetarian, etc.
    I do eat raw grass fed dairy and meat and I am not fat or sick! For the causes of those "diseases" look to the products of industrial farming and processing. Promote balanced moderate eating of all foods our Creator provided to match the needs of our bodies.

  44. Soy beans and things made from them are awesome.Monsanto sucks.This article does an excellent job of explaining what all Christians already knows.People and animals are different and if you mess around with what God created by tampering with DNA,the blueprint for all of His creations you end up with an abomination as in frankensoy.

  45. “…food source that has long been a boon to humankind…”?
    Westerners have only been consuming soy for around 20-30 years – yes, the Okinawans DO consume soy, but they also eat much more fish an pork than soy along with seaweed and fresh vegetables. This page is food for thought, with many good points, but the soy industry is far bigger and more powerful than the pastured meat industry and so it’s more likely that the author is in the pocket of big agra (Monsanto and their chums) than the possibility (implied here) that people like Sally Fallon are in the pocket of the meat industry (which Fallon despises by the way).

  46. I think your article can be parsed into oblivion in the same way you have done to Fallon and Enig. You cite research from organizations that are joined at the hip with Big Farma. In other words, these institutions are not interested in eliminating cancer–they all make fortunes from the public’s misfortunes.

    And some of your data is questionable. When citing the connection betw soy eating and low cancer in Asian countries, you imply causation. One of the biggest things about Asian diets and cancer is seaweed! So here, too, we may see correlation, but not causation. The list can go on, but my point is made.

  47. all I have to do is read the ingredients in most of the so called healthy soy products and I wonder how they can even be considered healthy.
    i am talking off the grocery store shelf items NO Thank you!
    will I have edamame once in a great while, sure; do I use tamari here and there, yup; but as a staple diet I don't think I am Asian enough!
    the article is excellently put together, but unless it is traditionally fermented the way it is eaten in Asian countries I will pass on soy!

  48. In reading the article by John Robbins, it soon becomes clear that he is an advocate and proponent of soy, not a doctor, not a clinical nutritionist, and not a scientist. He makes his best arguments rather than offering clear and neutral analysis. A more appropriate title for the article might be: "My Strong Opinions About Soy."

    The Robbins article underlines the fact that soy remains a highly controversial food for a number of compelling reasons. We each get to decide whether we want to be guinea pigs in an ongoing experiment in human nutrition when we eat industrial, highly-processed (and often GM to boot) soy foods, which is largely what we have access to in the US. Traditional soy food as produced and eaten in the Orient is a very different thing altogether, in the slow and careful manner in which it is made, the overall food quality, and the level of contaminants that reach the dining table.

    In The Breast Cancer Prevention Diet by Dr. Bob Arnot, M.D., the advocate and author is careful to note the (reputed) benefits of soy foods are dose-dependent: too little soy won’t provide the promised benefits, and too much soy can flood estrogen receptors and increase the estrogen effect, potentially promoting cancer. Dr. Arnot raises a key issue: it can be difficult to measure the exact dose of the desired active compounds one is ingesting through soy in the diet, since the content of soy foods can't easily be calibrated. Using soy food as medicine seems a tricky balancing act at best.

    There are many such issues.

    Even though I do better with a modest amount of (organic, grass-fed) meat in my diet, I appreciate the perspective of Dr. Gabriel Cousens, M.D. He sees the consumption of soy as largely a historical phase in converting our diets from one of excessive industrial, corn-fed meat to higher quality sources of non-meat protein. Cousens argues that there are many steps we can take to creating a better diet, with soy being merely a way-station in the transformation of our standard cultural fare to something better.

  49. Everything we eat has soy in it. It is so hard to avoid. I try to buy organic always and avoid non organic soy, because most likely it is a GMO product. Cookies, pastries ie. soybean oil. So, read labels and if you have thyroid problems it is best to avoid soy
    as much as possible. Cathy PS. I was a nutrition/health teacher at a local university
    for 25yrs.

  50. Wow grace I never knew that you cared so much about this issue! I also didn't know you had three children! Thanks for letting me know what's going on in your life and by the way, you enjoy grandmas meat and milk!!! Peace luv caecian

  51. I beleive we can do without soy and eat more raw fruits and veggies. My body is happy wiith that and healthy at 78 years young and getting younger I will out live my own children. I teach yoga, dancing on Ice, and long distance swimming. Warm Regards, bennett c josephson

  52. Enough of this modern-day nonsense already. How about a little time-tested history to slap some sense into the subject? The ancient Asian cultures only ate Soy during TIMES OF FAMINE. And even then, they only ate Soy that was fermented for FOUR YEARS. That was because it takes that long for the natural TOXINS in soy to break down. That settles it for any thinking person. Thank you.

  53. Ok, I just posted this and it disappeared a couple minutes later… let's see if the "TRUTH" about Soy is being edited yet once again.
    The ancient Asian cultures only ate Soy during TIMES OF FAMINE. And even then, they only ate Soy that was fermented for FOUR YEARS. That was because it takes that long for the natural TOXINS in soy to break down. Do think a culture that has been around for 6000 years might have figured out a few things in all that time?

  54. Reading this article and the comments, it seemed that this must be a different Sally Fallon and Mary Enig that I know them to be. Sally Fallon has studied numerous aspects of nutrition, with some emphasis on politics of food, and is a great source of reliable information. She could be wrong on some points, which she would not deny. Mary Enig was a young graduate student and knew biochemistry well when the cholesterol-heart theory was thrust on the American people. I think she would have been counted as one of the great scientists of the 20th century is she had not been shut out of any research funding by the soy industry. She spent her life fighting cholesterol myths, and lost. A very relevant paper now would be her "The Oiling of America." You will be amazed!
    Ira Edwards

  55. I won't go into detail, but you can easily compare for yourselves. Find "Tragedy and Hype" on for 12 pages of easy reading. It consists of citations of research that was omitted by the 1999 Third International Soy Symposium, a gathering of soy industry people who greatly exaggerated the benefits of soy. You will find it far different from the description here.
    For a positive view of soy, look for the Life Extension Foundation ( For a positive view of fermented soy products, Fallon and Enig can help with that.
    Ira Edwards

  56. Matt H Kennedy ,are you seriously implying that John Robbins is in with agra and pharma? And Soy is bigger that meat industry?
    I grew up in Asia where we ate tons of soy, and we never had problems.

  57. You don't know what you're saying. I'm an Asian. And we ate a TON of soy virtually everyday, and it wasn't time of famine. I don't know where you get that.
    We ate soy because it was cheap, readily available, and delicious in marinated dishes.
    Too many of you westerners have a romanticized version of what Asians ate.

  58. My understanding is that Organic no longer is 'clean' since they changed their standards to include 'SOME' pesticides and herbicides. Certified Natural has higher standards and allows 'NO' pesticides and herbicides.

  59. I was unimpressed because the article fails to distinguish between soy and soy products. My very unscientific take on the matter is that soy products seem to be very high in fat and because of this I avoid them with a passion.

  60. Thanks for rebutting the Weston A Price theories. The positive agenda of the Foundation that both Sally Fallon and Mary G. Enid espouse is tarnished by their negative agenda; anti-soy, anti-vegetarian. I support 100% their positive agenda promoting grass-only diet for Dairy cows. The science is with them on this. Their articles focus primarily on demonizing soy. Lets face it; The Weston A Price Foundation is anti-vegan/vegetarian dedicated to promoting an "old-timey" diet based on animal foods.

  61. Soy is so GMO today that I wouldn't eat anything on the label.

    As for Iodine being sufficient in table salt, I would have to disagree. Check out under the Iodine tab to find out more about that. We definitely don't have enough Iodine in our diet. And the farming lands are greatly depleted of minerals as well. I only consume unrefined salt. Personally, I LOVE Himalayan Salt. It is pink in color, which means it hasn't been bleached like regular table salt. Nor does it have any caking agents in it like table salt. It does have 80 minerals that our body needs too!

    I still believe that with all the GMO soy out there that I should avoid it at all costs. And with my thyroid troubles, it only makes sense to stay away from it. I don't need to add to my long list of health problems, I need to nourish my body with healthy food.

    There are also pages on FB that support the Iodine Protocol. Do a search and you will find them. Lots of great folks there willing to help.

    One last thing, DON'T use Iodine alone, you must follow the protocol, which includes using Magnesium, Selenium, unrefined salt and Vitamin C. If you don't use these nutrients with it, you will get sick. Your body will detox and it will not be pretty.

  62. My son, my daughter and I are are all sensitive to soy products, that is to say we all have effects when we eat soy products that make us feel very unwell. We therefore avoid them. Recently I was in northern Vietnam with the Hmong Tribe people staying in their village. These are an ethnic minority and they are totally self sufficient, growing what they need for their diet. We were served soy, unwittingly, and to my surprise we had no side affects at all. My only assumption is that these soy beans that they grew and processed were non GMO. An incredibly healthy and vibrant community.

  63. Up until now I was a follower of this 'food revolution', but your article has shown me that I am in error. I am a research nurse and teach proactive health. I see NO research to back up your statements, and can only conclude that all of this article is just opinion. My research on soy has led me to only one recommendation; if it is not fermented, don't put it in your mouth. Quite simply there are far too many health problems with the use of soy in any other form to make if safe for human consumption. Your inability to distinguish between fermented and non- fermented forms of soy and your lack of information on the presence of aluminum leads me to completely discount this article as uninformed opinion.

  64. This article, while addressing wholesale inaccurate scientific evidence of soy benefits, does not adequately address the looming specter of GMOs. If more than 90% of soy grown in this country is genetically engineered, where do GMO-free soy products originate, imports? There was not even a mention that cross-pollination drift is now rampant in the U.S. and other countries where failed "experiments" has ruined crops and soil to the point that, if GMOs were stopped immediately, decades will be required, if ever, to clear away the poisons allowed to permeate our precious food supplies by the FDA, USDA and other corrupt government agencies. If a well-thought-out article is to be presented, then all of the facts should be presented. GMOs ARE the most sinuous products ever introduced into society.

  65. Is the information in this article reliable? Who is the writer, What does she/he do for a living, and with due respect are you qualified to make these assumptions? I need to know because breast cancer runs in my family so heavily that it's on my father and mother's side. All my aunts have died from breast cancer, including my mother. Isn't soy estrogenic? And doesn't estrogen promote cancer?

    • His name at the top of the article is a link. Click it.

      Also, Google his name. He's well known. He's not in it for the money – he had plenty of that before starting his crusade (think Baskin-Robbins).

  66. Thank you for re-posting this wonderful article. It is important to note the profit motive of Fallon and Enig's scurrilous research and that their suppositions are really far afield from Dr. Price's research on native populations.

  67. The issues are confused by scientists who misinterpret findings from poorly designed experiments and studies. Anyone who eats as much soy as is subjects did in the studies mentioned in this article, is likely also eating a diet very low in meat. Unfortunately, we cannot, by this article alone, follow up with reading the experiments or studies to which O. Robbins refers as evidence contrary to "those who wish to build a case against soy," since the studies to which he refers are not cited, only mentioned. I recommend, for genuine insight into the causes of cancer and other diseases of affluence, The China Study, by T. Collin Campbell, a book that John Robbins heartily endorsed. Campbell's book is written for the lay reader, but is well cited, using his research and that of others. Campbell, as Enig, is a scientist whose work is published in peer reviewed journals. This counts for a lot, but not for everything. Read about Campbell on Wikipedia, then read about his book on Wikipedia, then read his book or even skim the charts and graphs. Especially this is important for – well, for everyone, actually. With respect and compassion, Peter B Metcalf

  68. Oh dear, I used to get upset about these things too. It seems that just about anything I eat is going to do some major harm. One way or another my life is going to kill me, so I try to do the best I can without forgetting to live along the way. Not eating will cause major harm too.

  69. I think the key to this article lies in the fact that animals react differently to different foods. A test on a rat may be different than on a human. EXTRAORDINARILY AS IMPORTANT is the fact that EACH AND EVERY HUMAN IS DIFFERENT. Some people are fine with soy. When I eat soy, even organic cooked to eliminate any digestive inhibitors, I KNOW IT. My body just does not do well on it. So, there are some things you can say are bad for all humans. Cigarrettes, alchohol, drugs, etc. Then there are the things you JUST HAVE TO LISTEN to your body to know if it agrees with you. Unfortunately, the american diet (sugar and white flour) has effectively turned that listening switch off for a lot of people. This country needs a lot of work.

  70. Thanks for rebutting the Weston A Price theories. The positive agenda of the Foundation that both Sally Fallon and Mary G. Enid espouse is tarnished by their negative agenda; anti-soy, anti-vegetarian. I support 100% their positive agenda promoting grass-only diet for Dairy cows. The science is with them on this. Their articles focus primarily on demonizing soy. Lets face it; The Weston A Price Foundation is anti-vegan/vegetarian dedicated to promoting an “old-timey” diet based on animal foods.

  71. I appreciate that you are trying to say something here, but I'm not sure what. The biggest danger from eating soy is from GMOs and from unfermented soy products. Though you admit GMO soy is not good for anyone, you don't seem to be aware that it is so prevalent "In April, The Wall Street Journal tested twenty food products labeled "GMO free" and found that sixteen of them contained at least traces of genetically modified ingredients; five had significant amounts. One of the companies testing positive, albeit with trace amounts, was Nature's Path Foods, the largest organic cereal company in the world."

    You cite studies done with fermented soy and use these to say all soy is good. A little sloppy.

    Even though you admit that pregnant women shouldn't eat soy,women who could get estrogen dependant cancer and those with low thyroid. but your conclusion is "this is a food source that has long been a boon to mankind"?

  72. Did I miss a sources list? In this article it talks about the phytic acid being able to be neutralized by cooking, but the Weston A Price site says that soy is one bean that it can't be. Also, Sally and Mary say that tempeh is fine to eat.

  73. Well, like so much else, all soy gets a bad rap because some companies process it dishonorably, like the ones who score low. I'm sure any fermentation used to make tofu lessens the nutritional value of the bean though.

  74. I think this is very informative, Soy alone is not the issue with increased estrogenic dominance. The exposure to xenoestrogens through environmental exposure of toxins is the real threat. Harmful chemicals that are very commonplace today have been linked to the"feminization" of many species, Even to the point of male frogs developing eggs in the Patomic river here in the States. As a note about GMO's if it does not say GMO free on the packaging is has GMO's. It is estimated that 90% of all processed foods contain GMO's.

  75. This artical is all a bunch of hog wash. I am taking Anti Estrogen Medicine Exemestane to get rid of and block the estrogen in my body to keep breast cancer from coming back. Soy has estrogen in it and that is going again the medication I am taking of no Effect. It is hard to find food without estrogen in them. The Stores should have estrogen free food just like Gluten and Lactose free foods.. There of Thousands and Thousands of women out there taking Meds. to block the estrogen from their systems and the Soy industries and Food producers are arguing that soy is good to combat Breast that is all a ball faced bunch of lies to put money in their pockets no mater what harm it is doing to people fighting cancer. Soy has estrogen in it and we are taking meds. to combat the estrogen intake and we are fighting a lozing battle.

  76. If you look at the "soy alert" on the WP website and then read the abstracts of the quote studies, you will see a world of difference in the studies quoted in this article and the truly bad science quoted by Fallon. Feeding rats the soymeal left over from oil extraction which contains hexane and then coming to conclusions about the health of people who would never eat this meal is bad science. Soybean oil is not soy as we eat soy. Soy is not a condiment in Japan – I lived there for 4 years – and there is a tofu shop in every little village. The twisting of truth to demonize soy is perplexing.Push butter, meat and whatever but why demonize soy? I have used it for three decades and have better health than almost anyone I know at my age and my daughter had soy milk when I could no longer breast feed – that is soy milk that I made, not commercial formula and she is also healthy at 37.

  77. Did you actually read the article? Here, I will help you out: "Although soy consumption on the whole reduces cancer incidence, there are questions about its effect on women who have estrogen-positive (ER+) breast tumors. These tumors are stimulated by estrogen. Might they therefore be stimulated by the weak estrogenic activity of the isoflavones found in soy? The jury is still out. There is some evidence this may be the case, though there is also evidence that soy consumption favorably alters the metabolism of estrogen so that it is less likely to stimulate tumor growth. For healthy women, according to the American Institute for Cancer Research, “even two or three servings a day of soyfoods should be fine as one part of a mostly plant-based diet.” The bit about cancer and soy is about a third of the way round. Its clear you probably did not read that far.

  78. My personal opinion is that I'd be careful about taking extra calcium. The hype about it originated in the campaign to get everyone drinking more and more dairy milk. Having said that, because soy milk has a less neutralizing effect on stomach acid than dairy milk, its calcium is probably better absorbed. There again, there are many other minerals which our modern diets neglect a lot more, and calcium supplementation is likely to cause a further imbalance.

    Magnesium is one of the most important minerals for us, and it's present in chlorophyll, which makes leaves etc green. It's probably the mineral we're most seriously deficient in.

  79. Thank you so much for this enlightening and well-researched article! There has been a dearth of real information on soy, with all kinds of wild accusations for which I, as a pharmacist, have not been able to confirm. What does make sense is that, since soy estrogen is much weaker than human estrogen, it is beneficial for pre-menopausal women because it can replace some of the human estrogen in the body. Post-menopuase, when women are producing less estrogen, the jury may be out. I have read that soy causes inflammation with some explanation as to why but I was unable to follow that logic, whether true or false. HERE'S THE REAL KICKER: Soy has been found to retard angiogenesis, which is the growth of new blood vessels. These new blood vessels are the lifeblood of cancer, which cannot proceed without angiogenesis. Retarding angiogenesis might be the future of cancer treatment.

  80. I live in the UK and would like to know if the clean 15 and dirty dozen apply here as well as in the US.

  81. A very appreciated, calm systematic article. So long, and I somehow wish the huge issue of Genetic Engineered is a problem for all so that is not organic, would be made earlier.

  82. If you're fearful that Dr. Robbin's paper is being sponsored by the Soy Industry be sure and trace back be sure and trace back to just who is making these claims against Soy; if you find they're backed by Monsanto or the Dairy Industry discount what they have to say.

  83. To the contrary, I'm trying to point out to Dominika and others who believe anything the American Food Industry giants have to say about the "awful dangers" of soy (soy milk, etc.) is somehow being driven only by their altruistic, good intentions rather than (what it actually is!) a concerted attack driven solely only by money, greed and these giants' intent to keep the dairy industry (as well as well as any and all other processed "foods" which are owned and controlled by any of these old guard food syndicates) free from the competition of this new breed of food producer, i.e. new companies actually offering real whole foods with "real scientifically verified health benefits", not bogus ones, to the American consumer. The Soy Producers have products that are doing just that!

  84. Needs references! I am a stage four ovarian cancer patient. I came to the US in late 2005 where there were no GMO foods. I had starting using soy milk in Australia, I think it was the same brand as here – Westsoy unsweetened organic soy milk. I walked 6 miles a day at least four times a week and had a very healthy diet. No fast foods, no sugar at all. 2007 my doctor tells me I am prediabetic. 2011 I have an extremely mild heart attack, and am diagnosed full diabetic. I was not as strict about organic as I am now. I had health problems all of 2012 until someone finally found the cancer. The common denominator for all of this was the soy milk in my coffee, and eating edamame at least once a week. So tell me, what caused my diabetes (hormone related), and my ovarian cancer (hormone related). I would love to be your study group.

  85. Today we are faced with so many controversies, deceit, arrogance and lies.
    As a practioner of Western Clinical Medicine, Chinese Medicine and Prophetic(Islamic) Medicine I have, over the years, learned one dictum: when you are faced with all the contrroversies and doubt, then take refuge in, and consult the Original Twin Sources of Truth: the Noble Quran and the sayings of the Prophet Muhammad( May God's Peace and Blessings be upon him). The Quran commands us to " strive to stay CENTRED; stay in the WASAT( the centre), and avoid the extremes." The Prophet Muhammad who is a mercy to ALL mankind, and who came to teach and live the Quran, said: "All illnesses start in the stomach. Eat only when you are hungry; and when you have finished eating, you must be a little hungry. Fill one third of your stomach with food, one third with water and leave the other third for air." I have calculated that one third of the stomach is equal to one of our clenched fists. In other words, EAT IN MODERATION. In this way we will avoid all of lifes' pitfalls. Sound advice indeed from God the Creator of man, and his last Prophet, Muhammad( May God's Peace and Blessings be upon him)
    Professor Ghoesain Mohamed

  86. Hi Nancy. I humbly say this: The cause of your dis-ease is probably OVER ACIDITY. You will help yourself a lot if you stay centred. Try to bring the pH of your blood to about 7.3 eating green vegies and other alkaline foods. and follow the advice of God who created us and all and His Prophets esp. the Prophet Muhammad who came with so much advice on health matters.
    I pray to God for your good health.

  87. It was only after eliminating eggs, milk, wheat that I came upon a small article implicating Soy as a mucusPhlegm instigator. 3 days after cutting out Soy my vocal chords had cleared. I had been suffering for years with having to clear my throat and making old man sounds as a result of excess mucus on y vocal chords. Mucus is a sign of one's body reactiing to an irritant. Sebaceous cysts had grown on a my face, neck & back.Cutting out Soy greatly cleared my throat and the cysts dried up after a while. I then realized Soy lecithin was EVRYWHERE…and I mean everywhere! You can hardly find a chocolate product wo soy. It was in Newman’s pasta the most non obvious products. Ubiquitous is an understatement! I seldom buy anything boxed; I make my food and check labels for sport. To me Soy (particularly ISP)is poison. However, I do have a bottle of Shoyu only because in my Raw cookbook it is an often used ingredient.

  88. I am allergic to soy. I discovered this after attempting to go vegan in the late 90s. I was never so sick from gastric distress and pain, and began avoiding obvious soy products like tofu in my diet. As the article points out, soy is in practically every product on the shelf, and my gastric distress continued until I eliminated all soy ingredients from my diet, with great difficulty, by reading every single label. it's found in virtually all breads, cereals, salad dressings, mayonnaise, chocolate, etc, etc. Awhile back I learned that GMO Roundup-laced soy products were introduced in 1996 and became 90% of soy consumed since then, and wonder if the Roundup residue is not what I am actually allergic to. But I am afraid to try organic soy because the distress is so great. I have discovered (after eating ginger daily in Taiwan on a trip in 2013) that a small piece of dried candied ginger alleviates the pain if I mistakenly eat something with soy in it. I hope my experience informs the research on what I consider this horrible product. Thanks so much for the article and conversation! BTW, my system is also very sensitive to all acid foods, like many fresh fruits and tomatoes, etc.

  89. The Soy lobby is quite powerful just like the corn lobby. Thee is lots of accumlating evidence that Soy is indeed bad for you. I first discovered this when my wife was diagnosed with graves disease. She was treated with radioactive iodine. It too forever to get her thyroid levels where they need to be. We finally got a good endocronoligist and he said to limit soy intake. I had to look into why. Soy has compounds the goitrogens as is mentioned in the article. What has the most of the them is the soy bean oil that has been pushed on people as the idiot anti-saturated fat boom began. Soy bean oil is calorie dense but also slows your metabolism down causing more rapid weight gain on less calories. Butter was replaced by margarine and crisco replaced lard. This transition also marks the onset of obesity and type II diabetes epidemic in the US. Coincidence I think not. Margarine can be left unrefridgerated sitting on a table for over a year and it will not got bad as nothing will eat it, not even bacteria. If bacteria won't touch it niether should you.

    Most of the studies done on this come from outside the US where the soy lobby does not have the influence that it has in the US. In Asia the historical consumptionof soy was only in a fermented form not the aldulterated soy we consume in everything now. Monsanto and Cargill are heavily vested in soy and will do everything to stop the truth from coming out.

  90. Soy formula has also been found to cause young girls to go into pubery much earlier and delay young boys from starting puberty.

    Soybean oil is ubiquitous in food as vegetable oil and it is horrible for you. Man studies out of New Zealand and Australia showing this and a recent article out of the University of California shows this as well. One can track the wide spread adoption of soy bean oil and it matches really well with rapid onset of obesity and type II diabetes in the US..

  91. Howard Roark Now you are talking plant oils, which is overall a different mattter. No refined plant oils are particularly good for you, especially after they are heated which causes decomposition. Fast food and fatty animal products are implicated in obesity and diabetes more than plant oils, so your citing of that as a "match" reduces your credibility. Please cite studies of soy formula and puberty.

  92. This is a very good, informative article and I am so pleased that after all the pros and cons soymilk is indeed a nutritious, healthy food, of course taken in moderation, like everything else.Thank you for this reassurance.

  93. Your comments are laughauble at best. There no actual studies showing soy to be anything but healthy. Don't use any of the b.s. studies that Weston Price or their groupies: Mary Enig, Kaayla Daniel, Lierre Keith, Joseph Mercoa, or Sally Fallon has writen as biblical proof. It isn't. And let's not dscuss sugar and it's effects on health.

  94. Are you certain that you are allegic and not low on iodine? Many doctors do not test iodine levels and this often registers as a soy allergy when, in fact, it's a iodine issue. 

  95. Our bodies require mucus to live. Look it up. The small amount of mucus created from soy is minimal in contrast to that produced by dairy milk. I do avoid any overprocessed foods like isolated protein but find this is easy to do if i make my own. So, I make tofu, tempeh, soy milk, etc. This reply was taken from a website with information that answers your comment about mucus.

    why does the body Produce Mucus?
    A: the body produces mucus because the substance exhibits characteristics that help it prevent and fight infection. the body also uses it as a catalyst for certain reproductive functions and as a lubricant. the water-based liquid contains carbohydrates, salts, and protein, all needed by multiple organ systems. the primary proteins are encapsulated in a sugar substance that allows them to absorb large amounts of water, which produce the hydrating properties of mucus on which the body depends for… 

  96. What difference does it make to you whether I have a soy allergy or an iodine deficiency? It is my body I'm monitoring every day, you have no idea about me, you simply need to defend soy, for some unknown reason.

  97. Whew! As a spokesperson/demo chef for Raleigh's Humana, I was told NOT to use soybeans this week by a friend who watched the @4 episode of "The Truth about Cancer" in which your son is a participant on another topic . As I will buy organic ones and double check their source, am relieved…and happy that the bad rap for soy is not an absolute.

  98. As a long-time vegan since reading A Diet for A New America in 1989, my children were raised on traditional soy products (soy milk, tofu, etc. as opposed to faux "meats" containing isolated soy protein). Both older now, both straight-A students (my son testing in the gifted range). Brain shrinkage? I don't think so. Both hit puberty on the later end of the spectrum (which I consider a whole foods plant-based diet bonus). All of this anti-soy hype is misplaced. The real focus should be on animal products like beef, pork, chicken, seafood and dairy. THOSE are the products that undermine health.

  99. ALL oils are harmful to human health – soybean oil (and even olive oil) included. You can reasearch this at or through the McDougall Program or PCRM or read The China Study.

  100. Cay Snow Look up research on metablism and soybean oil. What oil makes pigs get fat faster than any other oil (ding ding ding it is Soy bean oil). What animals metabolism is very close to that of humans (ding ding ding Pigs, close enough that we can use their insulin). Who funded studies of this? Farmers did back when pigs were raised for lard they wanted something that would make th pigs fat faster than anything. Soybean oil showed higher weight gain than anything they could feed them. Around this same time saturated fats animal and vegetable mostly the tropical oil Cocunut and palm became villified by clever marketing and in no time soybean replaced all oils in processed foods. In asia where soy comes from it is not consumed en masse like here. They basically only eat it fermented which gets rid of a lot of the metablism attacking compounds. Soy is not the miracle health food that the Cargill and Monsanto lobby would have you believe it is. Do you trust Cargill and Monsanto, I know I do not.

  101. For crying out loud, there are so many other foods to eat besides soy that I don't know why there is such a fuss about it. OK, so what if we don't eat soy. We can still live healthfully without eating animal products. And aren't animals finished (fattened) on soybeans? And isn't the flesh and milk of animals higher in concentrations of the foods that they eat? So wouldn't animal flesh be higher in the bad things that are supposedly in soy if they are fed soybeans to get fatter sooner? Cows are supposed to eat grass, not corn and soybean meal.

  102. I have been eating soy for MANY years and at 69, I don't take any meds., I'm never sick, all my blood work is fine and menopause was very easy. I only eat organic, grass fed, wild caught, and free range, everything and I always buy local. You pay the grocer or you pay the doctor, the choice is up to you.

  103. THIS is what clears up your question on what the dangers of soy might be??? I do not recognize you so thank goodness you are not filling my prescriptions at the store I use!!!

  104. I don't have any religious or quasi-religious or ideological axe to grind about this any more. I am just trying to ascertain the facts.
    Isn't it true that most soy oil consumed, until just a few years ago, was partially or fully hydrogenated?
    I think it is agreed by all in health-conscious circles that hydrogenation, like most commercial processing methods, is bad.

    There is also the problem of oversaturation of soy oil because it is cheap (in fact, govt subsidized), and more stable for use in processed foods than your o6 and o9. So we wind up overdosing long-term in omega 6. Not very good for cell membranes or anything inside them.
    However, omega6 is still essential — we must have it in the diet — just not in the high ratio in which the American processed diet provides it. (And of course, NEVER in GMO or hydrogenated form!)

    Nothing irritates me more than when tunnel-visioned ideologues misrepresent the facts to further their cause — whether vegans who claim animal foods (not even distinguishing between production methods) are behind every ill. Or their counterparts who now want to paint soy, even olive oil, as being behind every ill.
    I used to be one of those ideologues, but life, and a bit of humility, caused me to learn to put facts ahead of preconceptions.

  105. Nancy Churchill he was trying to tell you that your reaction may not in fact be an allergy. I had many food reactions for months, before discovering the worst of them seemed to stem from magnesium and B12 deficiency.

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