In 1992, the Swiss Health Service estimated that women consuming the equivalent of two cups of soy milk per day provides the estrogenic equivalent of one birth control pill. That means women eating cereal with soy milk and drinking a soy latte each day are effectively getting the same estrogen effect as if they were taking a birth control pill.

Researchers have identified a protein called zonulin that increases intestinal permeability in humans and other animals.7 This led to a search of the medical literature for illnesses characterized by increased intestinal permeability (leaky gut). Imagine their surprise when the researchers found that many, if not most, autoimmune diseases – including celiac disease,depression, type 1 diabetes, multiple sclerosis, rheumatoid arthritis and inflammatory bowel disease – are characterized by abnormally high levels of zonulin and a leaky gut.

several features of the modern lifestyle directly contribute to unhealthy gut flora:
Antibiotics and other medications like birth control and NSAIDs
Diets high in refined carbohydrates, sugar and processed foods
Diets low in fermentable fibers
Dietary toxins like wheat and industrial seed oils that cause leaky gut
Chronic stress
Chronic infections

In Step #1: Don’t Eat Toxins, I explained that one of the main reasons we don’t want to eat wheat and other gluten-containing grains is that they contain a protein called gliadin, which has been shown to increase zonulin production and thus directly contribute to leaky gut.

But what else can cause leaky gut? In short, the same things I listed above that destroy our gut flora: poor diet, medications (antibiotics, NSAIDs, steroids, antacids, etc.), infections, stress, hormone imbalances, and neurological conditions (brain trauma, stroke and neurodegeneration).



In fact, researchers have found that they can induce type 1 diabetes almost immediately in animals by exposing them to zonulin. They develop a leaky gut, and begin producing antibodies to islet cells – which are responsible for making insulin


That’s exactly what’s happening today. These four food toxins – refined cereal grains, industrial seed oils, sugar and processed soy – comprise the bulk of the modern diet. Bread, pastries, muffins, crackers, cookies, soda, fruit juice, fast food and other convenience foods are all loaded with these toxins. And when the majority of what most people eat on a daily basis is toxic, it’s not hard to understand why our health is failing.

Soy contains trypsin inhibitors that inhibit protein digestion and affect pancreatic function;
Soy contains phytic acid, which reduces absorption of minerals like calcium, magnesium, copper, iron and zinc;
Soy increases our requirement for vitamin D, which 50% of American are already deficient in;
Soy phytoestrogens disrupt endocrine function and have the potential to cause infertility and to promote breast cancer in adult women.
Vitamin B12 analogs in soy are not absorbed and actually increase the body’s requirement for B12;
Processing of soy protein results in the formation of toxic lysinoalanine and highly carcinogenic nitrosamines;
Free glutamic acid or MSG, a potent neurotoxin, is formed during soy food processing and additional amounts are added to many soy foods to mask soy’s unpleasant taste; and,
Soy can stimulate the growth of estrogen-dependent tumors and cause thyroid problems, especially in women.

First, the soy products consumed traditionally in Asia were typically fermented and unprocessed – including tempeh, miso, natto and tamari. This is important because the fermentation process partially neutralizes the toxins in soybeans


Because plants like cereal grains are always competing against predators (like us) for survival. Unlike animals, plants can’t run away from us when we decide to eat them. They had to evolve other mechanisms for protecting themselves. These include:
producing toxins that damage the lining of the gut;
producing toxins that bind essential minerals, making them unavailable to the body; and,
producing toxins that inhibit digestion and absorption of other essential nutrients, including protein.

How to maintain and restore a healthy gut

The most obvious first step in maintaining a healthy gut is to avoid all of the things I listed above that destroy gut flora and damage the intestinal barrier. But of course that’s not always possible, especially in the case of chronic stress and infections. Nor did we have any control over whether we were breast-fed or whether our mothers had healthy guts when they gave birth to us.

If you’ve been exposed to some of these factors, there are still steps you can take to restore your gut flora:
Remove all food toxins from your diet
Eat plenty of fermentable fibers (starches like sweet potato, yam, yucca, etc.)
Eat fermented foods like kefir, yogurt, sauerkraut, kim chi, etc., and/or take a high-quality, multi-species probiotic
Treat any intestinal pathogens (such as parasites) that may be present
Take steps to manage your stress