Isoflavones found in soy only suppress menopause symptoms for some women. In a study done by Bowman-Gray School of Medicine the ability of soy protein isolates to relieve menopausal symptoms. The positive side was that this study showed that soy does decreased the severity of hot flashes. Soy contains five different types of plant chemicals that can be toxic to humans if not removed by a special process. These toxins include phytates, protease inhibitors, genistein, goitrogens and allergens.
Allergens can cause severe allergic reactions in some individuals.
Phytates tightly bind up essential minerals, including zinc, preventing them from being absorbed into the body. Phytochemicals found in soy inhibit the enzymes that digest protein into simple building blocks of amino acids. Protease inhibitors are what AIDS patients currently take and a good lesson learned the hard way from the use of protease inhibitors is that it inhibits the pancreatic enzymes. Protease inhibitors prevent you from digesting food. Note that if you are estrogen dominant or taking birth control pills, you have problems with high copper and low zinc.