The Dark Side of Soy

'There is important information on the cancer-protective values of soy,' says clinical nutritionist Ed Bauman, head of Bauman Clinic in Sebastopol, California, and director of Bauman College. Bauman cautions against painting the bean with a broad brush. 'As with any food, it can have benefits in one system and detriments in another. [An individual who is sensitive to it] may have an adverse response to soy. And not all soy is alike,' he adds, referring to processing methods and quality.

'Soy is not a food that is native to North America or Europe, and you have issues when you move food from one part of the world to another,' Bauman says. 'We fare better when we eat according to our ethnicity. Soy is a viable food, but we need to look at how it's used.'

Once considered a small-scale poverty food, soy exploded onto the American market. Studies--some funded by the industry--promoted soy's ability to lower disease risk while absolving guilt associated with eating meat. 'The soy industry has come a long way from when hippies were boiling up the beans,' says Daniel.

These days the industry has discovered ways to use every part of the bean for profit. Soy oil has become the base for most vegetable oils; soy lecithin, the waste product left over after the soybean is processed, is used as an emulsifier; soy flour appears in baked and packaged goods; different forms of processed soy protein are added to everything from animal feed to muscle-building protein powders. 'Soy protein isolate was invented for use in cardboard,' Daniel says. 'It hasn't actually been approved as a food ingredient.'

Soy is everywhere in our food supply, as the star in cereals and health-promoting foods and hidden in processed foods. Even if you read every label and avoid cardboard boxes, you are likely to find soy in your supplements and vitamins (look out for vitamin E derived from soy oil), in foods such as canned tuna, soups, sauces, breads, meats (injected under poultry skin), and chocolate, and in pet food and body-care products. It hides in tofu dogs under aliases such as textured vegetable protein, hydrolyzed vegetable protein, and lecithin--which is troubling, since the processing required to hydrolyze soy protein into vegetable protein produces excitotoxins such as glutamate (think MSG) and aspartate (a component of aspartame), which cause brain-cell death.

Soy also is one of the foods--in addition to wheat, corn, eggs, milk, nuts, and shellfish--most likely to cause allergic reactions. Most people equate food allergies with anaphylaxis, or a severe emergency immune response, but it is possible to have a subclinical sensitivity, which can lead to health problems over time (and is exacerbated by the lack of variety common in today's American diet).

'People can do an empirical food sensitivity test by eliminating the food for a period of time and reintroducing it to see if there's an immune response, but most don't do this,' says Bauman. 'Genetically modified (GM) soy is the most problematic, and that's probably what most people are eating if they're not paying attention. People can develop sensitivity to a food that has antigens or bacteria not originally in the food chain, as is the case with GM foods.'