My PSA for the day: The New England Journal of Medicine article, “Soybean Goiter: Report of Three Cases, three cases of infants developing goiter when they were consuming soybean“formula.”The condition was rapidly eliminated in two of the infants when the soy “formula” was terminated. The third child was cured when iodine was added to the diet. What did soy formula have to do with thyroid (goiter) problems? Soybeans are a source of isoflavonoids, including genistein and daidzein. Contrary to popular belief and what is often reported in the media, they are both hazardous to your health. The following comes from Biochemical Pharmacology, Vol. 08-096-99 and contain compounds (genistein and daidzein –the ‘active ingredients’) that inhibit [interfere with] thyroid peroxidase (TPO) which is essential to thyroid hormone synthesis [production].” Soybeans are NOT good for the thyroid!