Soy in our diets is fairly recent. Prior to processed foods, we really didn't eat it. In Japan and China, they found a way to ferment it to produce something edible (tofu) that didn't raise havoc with the digestive system. In today's highly processed food marketplace, soy (and corn) is added to almost everything. According to Michael Pollan (In Defense of Food), Corn and soy products are found in about 70% of the foods carried in the typical grocery store. I think it's a safe bet to say that the rise in food allergies, especially corn and soy, is directly related to the increase in the consumption of these foods in the modern American diet.
One small correction... TOFU IS NOT FERMENTED... MISO IS FERMENTED.
You're right...oriental countries ferment the soy they ate and even then only ate it in very small quantities like a condiment rather than a main food source.
One of the things that soy is causing (due to it's prevalence in our diet) is a HUGE INCREASE IN THYROID ISSUES. If you do any research, you will find that soy consumption is directly related to thyroid problems. Thyroid was very seldom an issue prior to the acceptance of soy as a basic staple in the American diet. Even soy oil has this effect - and you find it in almost every processed food and often hidden by calling it "vegetable oil".
If you do much research, you'll find the the main use for soy in earlier days was to grow it as a cover crop to be tilled in as a natural fertilizer, after which FOOD CROPS were then grown in that soil. The anti-nutrient level in soy is so great as to cause nutritional deficiencies in people and animals that consume it directly as part of the diet, but it works great as a fertilizer - and the plants grown on those fields are able to uptake the nutrients and use them.
Very frustrating that the desire to make money on waste products has been so cleverly marketed that we all believed it was the healthy thing to eat.
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