Is soy a disease-preventing miracle food or a dangerous health threat disguised as diet-friendly protein? Here are both sides of the story, and why there's no clear picture of soy's health pros and cons.
The U.S. Food and Drug Administration announced in 1999 that diets including daily soy resulted in a significantly reduced risk of heart disease, the No. 1 cause of death in the United States, then and now.
With the announcement, soy officially became a darling of the health-food world and a cornerstone of American diets.
Fast-forward 13 years, and soy products are still widely seen as healthy alternatives to their animal counterparts. Soy protein saturates supermarket shelves — sneaking into everything from cereal to protein bars to crackers to frozen meals and even surprising places like some brands of canned tuna — not to mention the more recognizable forms of soy, including edamame, tofu, soy milk, soy cheeses, and soy meats.
But as soy's popularity wages on, some notable nutritionists and doctors now warn against consuming soy in any form, including the processed and packaged foods that contain types of soy protein.
Isoflavones: Soy's Potentially Dangerous Compound
The reason is soy's isoflavones, a naturally occurring plant compound that is present is all forms of soy, including organic soy, which is a type of phytoestrogen. Phytoestrogen is produced by plants and is slightly different from the estrogen hormone produced by the human body. But in excess, it can create some of the devastating effects of estrogen overload in both men and women. Although soy isn't the only source of isoflavones in the modern diet (all legumes have them), soy is the most concentrated, says Amy Gross MPH, RD, CDN of the NewYork-Presbyterian Hospital Weill Cornell Medical Center in New York City. To make things more confusing, while isoflavones harm some people, they have been found to be beneficial in others.
"There are different theories as to why these things may affect us differently, or exacerbate one thing and improve another in our bodies," Gross says. "It could potentially bind to estrogen receptors in different cells in our body. It could act similarly to estrogen or take over where estrogen would usually take over when looking at that receptor itself that would be on that individual cell. There is a lot of research that tells different stories."
Soy's Health Benefits and Risks: Why the Jury Is Out
"Soy is very heavily marketed as a healthy food," says Kaayla Daniel, PhD, a nutritionist and author of the book The Dark Side of Soy, "but the fact is, we've got hundreds of studies that link soy consumption to malnutrition, ADHD, immune system, reproductive health problems, digestive disorders, certain types of cancers, and more." It is also important to note that non-genetically modified soy and organic soy has been linked to these health conditions as well, Daniel says. Israel and Germany have issued warnings against the consumption of soy foods for young children and infants. New Zealand also warns that soy formula for infants should only be used as a last resort. To date, these three countries are the only ones to come out forcefully against soy consumption.
Still, some studies indicates that soy in moderation, particularly tempeh, miso, and other soy sources with relatively low levels of isoflavones, can be beneficial — though many of these pro-soy studies have been funded by soy lobbying groups, such as the Soybean Board.
Here's a look at some of the conditions soy can affect.
Should You Eat Soy?
Soy, like all foods, has pros and cons, so like all foods, the take-home message is to consume it in moderation. Gross recommends eating one to two servings a day, max, as part of a balanced diet, which includes plenty of fruits and vegetables, whole grains, low- or nonfat dairy, and other sources of lean protein. Because soy often hides in processed foods under aliases such as "textured vegetable protein," it's important to read nutrition labels on anything you buy to make sure it doesn't have hidden soy along with other ingredients.
"Soy is in so many things you might not expect," Daniel warns. "Just about everything that comes in a package. If you’re eating a lot of processed and packaged foods, you're also eating additives and flavorings, high-fructose corn syrup, and who knows what else, so it's not just the soy that's the problem in those products."
Instead, Daniel and Gross both recommend preparing whole foods at home that you can make from scratch, and avoiding processed foods whenever possible for overall health.
"I think that it’s entirely appropriate to include soy in your diet," Gross says. "But I wouldn’t have it be everything that you’re eating. We need a variety of foods, and if you're focusing on one food, you might be missing out."
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