Thanks to Michael Pollan, many Americans are now aware that when a food boasts a health claim it usually means it’s actually not that healthy after all. But there’s one food that consistently flies below the radar despite its numerous health claims when found in processed and packaged foods: Soy. A long-time staple in the American health food repertoire, it is a prominent example of Pollan’s observation. And the research is mounting that soy foods are not only questionable in terms of their benefits, but in fact, may be hazardous to your health.

Most recently, the Cornucopia Institute conducted research on the processing of soy foods and found that the industry commonly uses hexane—a petroleum-based solvent and known neurotoxin—to process soy ingredients found in many “natural” food products.

Thanks to their research and consumer concern, the Cornucopia Institute announced last week that some companies have voluntarily changed their processing practices and eliminated hexane from their products. Unfortunately, there are still well over two dozen “all-natural” nutrition bars and veggie burgers that still use hexane to process soy.

But hexane processing is really just the tip of the iceberg when it comes to problems associated with eating soy—and many of the health problems are unknown to the general public.

In 1999, the FDA approved the health claim that soy is “heart healthy” and reduces the risk of cardiovascular disease. But this wasn’t without controversy. Two researchers for the FDA, Daniel Doerge and Daniel Sheehan stated that they were opposed to the labeling of foods containing soy as heart healthy since there was “abundant evidence that some of the isoflavones found in soy…demonstrate toxicity in estrogen sensitive tissues and in the thyroid.”

The two researchers refer to numerous studies that show the estrogenic quality of soy isoflavones have harmful effects on many in the population. Isoflavones are a type of phytoestrogen, or plant-based estrogen that mimics human estrogen. It functions similarly to other endocrine disruptors (which I wrote about here on Civil Eats) and binds to our estrogen receptors. Consuming soy elevates estrogen levels, which is correlated with increased risk for breast cancer (and other estrogen-sensitive cancers as well), as 80 percent of U.S. breast cancers are associated with estrogen supplementation. In one study reported in the American Journal of Clinical Nutrition, women who already had breast tumors were given a soy drink for 14 days and their breast tumor growth increased significantly.

In another study the researchers for the FDA refer to, consumption of soy is linked to brain aging, shrinking, and the development of Alzheimer’s disease. In this 35-year Hawaiian study of 8,900 Japanese men and 500 of their wives, tofu intake was the only factor that correlated with an increased occurrence of Alzheimer’s disease. The researchers wrote, “This finding is consistent with the environmental causation suggested from the earlier analysis, and provides evidence that soy (tofu) phytoestrogens causes vascular dementia.”

Perhaps most alarming is the use of soy-based infant formulas. They pose such a risk that the health ministers of the United Kingdom and New Zealand have advised parents not to use soy formula. Studies have found that soy-fed infants have estrogen levels an average of seventeen thousand times higher than infants fed human or cow’s milk.

For men, estrogen-rich soy is also problematic. The Israeli Health Ministry warns men to exercise caution in regards to soy consumption as it has been shown to lower virility—since eating soy reduces testosterone and increases estrogen. In one study presented at the 2007 conference of the American Society of Reproductive Medicine, researchers found that in subfertile men, those eating the most soy had forty-one million fewer sperm per milliliter than those who consumed none. The average amount consumed was equivalent to half a tofu patty. In the womb, excess estrogen causes abnormal sexual development and low sperm counts in boys and men.

As is clear from these studies, the phytoestrogens in soy are quite powerful. While other foods (flaxseed, garbanzo beans, and oats, for example) also contain some amount of phytoestrogens, soy contains the highest amount—and since it is often used in such large quantities as a replacement for meat or dairy, it’s more problematic than other foods. Proponents of soy often refer to the long history of its use in Asian cultures but they fail to mention just how much is typically eaten. In Japan the average amount of soy consumed on a daily basis is two tablespoons, in China it’s two teaspoons where it’s eaten as a condiment rather than a replacement for animal products.

In America however, since soy is in thousands of processed foods (usually in the form of soy protein isolate, soy isoflavones, textured vegetable protein, and soy oils) it accounts for a fifth of the calories in the American diet—not to mention the actual soy foods and drinks that some use as a replacement for meat or dairy. Soy isoflavones were actually denied status as “generally regarded as safe,” or GRAS, as a food additive by the FDA due to the many uncertainties surrounding them. A senior scientist for the FDA wrote, “Confidence that soy products are safe is clearly based more on belief than hard data.”

What’s more, unfermented soy (tofu, soymilk, soy cheese, ice cream, yogurt, soy protein shakes, soy protein isolate) contains high amounts of phytic acid which blocks mineral absorption—particularly calcium, magnesium, iron, and zinc; and soy is an unusual protein that is difficult to digest. Soy is also a goitrogen, meaning it depresses thyroid function and interferes with the absorption of thyroid hormones as well as the crucial mineral iodine.

Fermented soy (miso, natto, tempeh, and soy sauce), most commonly eaten in Asian cultures, is easier to digest and contains far less phytic acid. In addition to choosing fermented soy products over others, choosing organic soy products means avoiding the 91 percent of soybeans produced in this country that are genetically modified and highly contaminated with pesticides.

Why haven’t you heard many of these facts and figures when it comes to “heart healthy” soy? Soy production is a major player in the industrial food system. According to the USDA, in 2009 the total acreage of soybeans planted in the U.S. was 77.5 million acres, accounting for the largest source of protein feed and the second largest source of vegetable oil in the world. In 2008-09, the farm value of soybean production was $29.6 billion, the second highest among U.S. produced crops.

So let’s remember Pollan’s decree: “a health claim on a food product is a good indication that it’s not really food, and food is what you want to eat.” And in fact, this applies to nearly every health claim, even the ones that you might not suspect. It’s good to note, too, that when the food in question is one of the largest players in the industrial food system, you can bet we’re not getting the whole story.

Photo: ryoryozo via Flickr

If you think diabetes and obesity are the two biggest health care crises Americans face these days, you’re missing the forest for the trees — literally. Because the roots of all this diet-induced disease lie in two less publicized but even more pernicious epidemics: nature deficit disorder and kitchen illiteracy.

The symptoms include a woeful lack of familiarity with that elusive culinary commodity known as “real food,” or “good food,” or “slow food,” and total estrangement from Mother Earth — who, by the way, keeps hanging around outside pining for a glimpse of you while you remain indoors, mesmerized by your monitor or TV screen and mindlessly munching on ersatz edibles.

Do you have no idea what you’re actually eating, where it came from, or how it was grown? You may suffer from one or both of these maladies. Are you fearful of naked food that’s not encased in microwave-friendly packaging? Petrified by perishable produce that demands any sort of prep?

Perhaps you’d buy the new wearable feedbag that lets Americans eat more and move less, or sample Taco Bell’s new “green” menu with no ingredients from nature, if these products existed outside the fertile imaginations of the Onion’s writers.

If we weren’t so divorced from nature, we’d give a rat’s ass — make that a double rat’s ass — about all those freaky deformed frogs that have been sprouting extra legs in recent decades, and the sexually deformed fish that started popping up in the Potomac a few years back.

As New York Times columnist Nicholas Kristof pointed out in his column last Sunday and again on Thursday’s Colbert Report, scientists increasingly suspect that “a class of chemicals called endocrine disruptors, very widely used in agriculture, industry and consumer products,” may be contributing to a scary hodgepodge of health problems in people as well as the disturbing rise in anatomical anomalies in frogs and fish.

Kristof cites a “landmark” 50-page statement from the Endocrine Society which presents “evidence that endocrine disruptors have effects on male and female reproduction, breast development and cancer, prostate cancer, neuroendocrinology, thyroid, metabolism and obesity, and cardiovascular endocrinology.” The statement adds:

I wrote back in 2006 that the EPA had identified endocrine disruption as one of its top six research priorities in 1996. But, a decade later, they had yet to begin testing any candidate chemicals for their endocrine-disrupting potential. Kristof notes that “for now, these chemicals continue to be widely used in agricultural pesticides and industrial compounds. Everybody is exposed.”

Sure, you could try to minimize your exposure to these apparent toxins by growing some of your own food without using pesticides and chemicals. But as our farming First Lady’s recently discovered, the ground you’re cultivating might be tainted anyway, because the chemicals and contaminants we’ve thoughtlessly dispersed into our air, soil and water in recent decades have a way of lingering.

Our obliviousness to the hazards of a chemically dependent food system have allowed these toxins to accrete in our environment — and our bodies — for far too long. But now, growing tomatoes has replaced throwing tomatoes as a form of protest: millions of Americans are looking to opt out of our toxic food chain by trying to grow some of
their own food this year, many for the first time.

If we truly hope to create an alternative food system, though, many more of us will have to roll up our sleeves and get digging. As urban ag pioneer and MacArthur genius Will Allen told Elizabeth Royte in Sunday’s New York Times Magazine, “We need 50 million more people growing food on porches, in pots, in side yards.”

Royte notes the inherent challenges for advocates of urban agriculture:

But the edible landscaping trend is taking root wherever there’s soil, and even where there isn’t, with the help of exhibits like the New York Botanical Garden’s Edible Garden, which just opened last weekend and runs through September 13th.

The Edible Garden exhibitions include a Good Food Garden, a Seed Savers Heirloom Vegetable Garden, and a Beginner’s Vegetable Garden, along with a half dozen other edible landscape-related exhibits. Rosalind Creasy, whose essential but long-out-of-print book Edible Landscaping has a new edition coming out in 2010, thankfully, designed the Heirloom Vegetable Garden. Other homegrown heroes like Kitchen Gardeners International founder Roger Doiron and Slow Food USA‘s new president Josh Viertel will be among the featured speakers at events taking place over the course of the summer.

If I may borrow from Stephen Colbert, I’d like to give a tip of the hat to cookware company Anolon, a major sponsor of the NYBG Edible Garden exhibition whose own Creating a Delicious Future campaign seeks to remedy kitchen illiteracy by fostering “a return to eating delicious foods prepared simply at home using fresh, seasonal, local ingredients.”

The exhibition’s other major sponsor, Scott’s Miracle Gro, gets a wag of the finger: hey, guys, great way to greenwash the profits from all those pesticides the EPA has ordered you to take off the shelves.

Another wonderful edible gardening program to which I’ll gladly give a shout-out is the Giving Through Growing campaign sponsored by Robert Mondavi’s Woodbridge Winery in partnership with The American Community Gardening Association. Woodbridge is donating $40,000 this year to the ACGA to help provide “educational tools, leadership training, and community building strategies to participants in New York, Chicago, Atlanta, and Los Angeles.” As the Giving Through Growing website notes, the ACGA estimates that over 2,000 new community gardens will be established this year, on top of the 20,000 existing community gardens.

The Giving Through Growing program encourages you to send virtual “eSeeds” to your friends, and for every eSeed that’s planted, Woodbridge will donate a dollar to the ACGS. It’s a pretty painless way to show support for the folks who are greening our urban spaces.

Those of us who garden understand that food waste can either become “black gold,” i.e. soil-enriching compost, or be shipped off to the landfill where it rots and generates methane, a particularly potent greenhouse gas. Animal manures, too, can be a blessing to a farmer who raises his livestock on pasture, where the manure returns fertility to the soil as it has for centuries.

But when you crowd farm animals into what Jon Stewart aptly dubbed “an Abu Ghraib of animals” on Thursday’s Daily Show in his interview with Food, Inc.‘s Robert Kenner, the massive quantities of manure that result become an environmental disaster.

And when you saturate the soil with synthetic chemicals to grow resource-intensive commodity crops, you deaden and deplete it.

This, then, is the fundamental difference between sustainable agriculture and intensive industrial food production. The first method enriches the soil; the other ultimately ruins it. Destroy the soil, and you destroy your civilization.

Will Allen predicts that 10 million people will plant gardens for the first time this year. But, as he told Elizabeth Royte, “two million of them will eventually drop out,” when they get discouraged by pests and insufficient rain — or too much.

That’s OK; 8 million new gardeners still adds up to a revolution. So grab your trowel and start digging for democracy. Let’s overthrow the cornarchy this 4th of July!

Cross-posted from The Green Fork.