Soy-based products are still quite popular, and the majority of them are touted as “health” foods. However, there is a huge difference between fermented and unfermented soy products.
People of Asian descent like me tend to eat fermented soy products such as soy sauce, miso and tempeh (I draw the line at natto, which is another fermented soy product with a distinctive texture and flavor which I can’t stand). The fermented forms of soy based foods are safe because the fermentation process destroys the antinutrients which are present in soybeans.
In stark contrast, unfermented soy products, including soy milk and tofu, have high concentrations of these antinutrients, including phytates, phytoestrogens, MSG, saponins, trypsin inhibitors, and goitrogens. These substances have multiple deleterious effects on the body, such as impaired absorption of vitamins and minerals, interference with pancreatic and thyroid function, disruption of endocrine function, and damage to the nervous system.
For these reasons, I am strongly opposed to the consumption of soy-based products and eliminate them from patient and client diets whenever possible. If you are vegan, or if you are intolerant of whey or casein, look for other forms of protein, such as pea, quinoa, hemp and amaranth, which cause less inflammation when consumed and have a more benign side effect profile.