This doesn’t answer your question, but may provide more info. The following is a sneak preview of part of Doug Kalman’s next “Alternative Pharmacist” column:
"…the Foods Standards Agency of the United Kingdom (www.foodstandards.gov.uk) recently released a report denoting that phytoestrogens as found in soy (and in other foods/supplements) does have estrogenic effects on estrogen receptors and thus in some females may increase the risks of hormone sensitive cancers. The report also said that infants fed soy formulas are exposed to the greatest concentrations of phytoestrogens (isoflavones). Finally, the report noted that soy can interrupt and disrupt thyroid function and activity in infants by inhibiting the enzyme thyroid peroxidase.
These findings have led the U.K. government to recommend that physicians monitor thyroid function in infants fed soy-based formulas. The agency (FSA) also noted that in some animal studies soy altered reproductive health (ala the soy-boy).
The report should also make many rethink their vegan or strict vegetarian ways. The FSA believes the high soy intakes in these groups have an even greater estrogenic potential and thus may have a mountain of possible negative health side effects over years of eating this way.
Also, the FSA strongly stated that individuals with hypothyroidism and who take thyroid replacement while on a high soy diet, run the risk of not having the medicine actually work since the phytoestrogens in soy can disrupt thyroxine activity.
To summarize, while us in the “T-know crew” know much of the aforementioned, many people in our society do not. Soy supplementation may just be the antithesis of a supplement for the bodybuilder or powerlifter. However, if you eat soy every now and then, there should be no worries. It’s the aspect of soy disrupting thyroid function in infants, hypothyroid people on replacement, and perhaps even the dieter that give me concern. Couple this with the fact that soy may not be good for the female with breast cancer or at risk for breast cancer and we have a misinformation campaign that has been played on the U.S. public.
In short, soy sucks."
The full article will run this Friday!