This is true! One of my lectures at med school was on phytoestrogens like those found in soya, and the effect on fertility/sexual vigor in animals (rats and fish, mostly).
There haven't been any studies conducted on humans, as far as I can tell. The only way is to study vegan or vegetarian populations who depend on soya as a protein source - Hindus or Japanese vegetarians, for example? They seem pretty fertile to me, though.
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There haven't been any studies conducted on humans, as far as I can tell. The only way is to study vegan or vegetarian populations who depend on soya as a protein source - Hindus or Japanese vegetarians, for example? They seem pretty fertile to me, though.
Doctors are very interested in the properties of phytoestrogens for the treatment of menopause and hormone-linked cancers like prostate cancer.