It is BS, but there are oestrogens in soya, as in many other things like dairy products as well - funny though that bodybuilders fear soya like nothing else but rarely say anything about the oestrogens in dairy products
I usually answer with the following:
1. If you are worries about the oestrogens in soya, you should also avoid dairy products, whey included, which also have oestrogens.
2. phytoestrogens bind to estrogen receptor's yet are 1/500th the
potency so they may actually inhibit estrogen.
3. men have very few estrogen receptor's to begin with (10 lbs of excess
body fat and your body would probably produce enough to fill these)
4. Most importantly, several clinical studies have shown that soya does not have any effects on hormone levels. Some studies:
Soy milk intake in relation to serum sex hormone levels in British men.
http://www.ncbi.nlm.nih.gov/entrez/quer ... s=12094627
"Soy milk intake was not associated with serum concentrations of testosterone, free testosterone, androstanediol glucuronide, sex hormone-binding globulin, or luteinizing hormone. These results suggest that soy milk intake, as a marker of isoflavone intake, is not associated with serum sex hormone concentrations among free-living Western men."
Hormonal effects of soy in premenopausal women and men.
http://www.ncbi.nlm.nih.gov/entrez/quer ... s=11880595
Effect of soymilk consumption on serum estrogen and androgen concentrations in Japanese men.
http://www.ncbi.nlm.nih.gov/entrez/quer ... s=11303585
"None of the other hormones measured (estradiol, total and free-testosterone, or sex hormone-binding globulin) showed any statistical difference between the two groups in terms of patterns of change. The results of the study indicate that soymilk consumption may modify circulating estrone concentrations in men."
