Bullshit que te diría un americano. Y aquí te dejo dos estudios y me voy:
http://www.ncbi.nlm.nih.gov/pubmed/19524224
Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis.
http://www.ncbi.nlm.nih.gov/pubmed/20378106
Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence.
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