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Several sources claim that eating soy has an effect on estrogen levels (for example, Livestrong, American Cancer Society and sfgate).

Some sources go further and say eating soy affects men's sex-drives:

Soy foods lower your sex drive (Japanese housewives would feed more soy to their husbands to reduce their virility when they feared infidelity or pregnancy) Soy’s has also been proven to lead to infertility in males.

Source: HealthLevelUp

Does soy affect sex drive (via estrogen levels or otherwise)?

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  • could be split into 2 parts, does soy increase estrogen and are high levels of estrogen harmful to a male's fertility
    – ratchet freak
    Commented Aug 27, 2013 at 11:58
  • @ratchetfreak I'm not interested just in male fertility but rather in virility as a whole. Would changing the second part of your proposal to consider the more general issue suggested by comment be OK?
    – Git Gud
    Commented Aug 27, 2013 at 12:02
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    Welcome to Skeptics! We want to focus our attention on doubtful claims that are widely held or are made by notable people. Please provide some references to places where this claim is being made.
    – Oddthinking ♦
    Commented Aug 27, 2013 at 12:04
  • @Oddthinking Oh, all right. Thank you for warning me.
    – Git Gud
    Commented Aug 27, 2013 at 12:07
  • About splitting to two parts, I'm not sure that's as simple as that, AFAIR soy contains something that is similar but not identical to Estrogen.
    – Ofir
    Commented Aug 27, 2013 at 12:14

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This appears to be the subject of active study, but so far the results do not seem to indicate a significant effect - http://en.wikipedia.org/wiki/Phytoestrogens#Health_risks_and_benefits

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