Since Andriana keeps saying soy will turn men into bitch-tittied estrogenified tiny-penised Arawn-weight wimps, I thought I'd investigate.
I asked some dude who knows his shit about soy:
phytoestrogen = isoflavone = plant hormone similar to human estrogen, but barely has any effectQuote:
soy in men showed a small impact on hormones at high phytoestrogen intakes (something like 70 mg which would be 2X30 g scoops of soy protein)
lesser amounts have no impact.
IMO, a small amount if fine, you don't want to live on the stuff
The other soy risk is: if you're iodine deficient (typical diet of 99% of people aren't), you could devlop goiters due to thyroid problems. That is, soy is harmless to thyroid if you've got a decent overall diet or supplement w/ iodine. In fact, babies can be fed w/ soy "milk" + iodine (but not w/o).
So, soy (in moderation) just isn't going to do any harm. They've only been able to show any effect on sex hormones w/ huge doses.
If you had to choose between soy protein or no protein, you'd take the soy.
Soy industry propoganda: http://www.soyfoods.org/health/primer-on-soy/