The reason why soy is so bad basically boils down to the isoflavones that it contains. Two of these isoflavones, genistein and daidzein, are what cause the majority of negative effects seen with soy protein use. These two villains bind readily to Estrogen Receptors. This can have numerous adverse effects on everything ranging from Testosterone production, thyroid production, muscle growth, and even health. The ability of soy protein to decrease Testosterone levels has been well demonstrated. One study displayed a 76% reduction of Testosterone production in men, after ingestion of soy protein over only a brief period of time. Another study, using healthy adult males, a diet containing soy was compared to a diet that consisted of meat protein in terms of sex hormone concentrations. Well, after evaluation, Testosterone levels were significantly lower in the soy diet. Not only this, but the estimated amount of free Testosterone was 7% lower after the soy diet as well. The evidence seems pretty conclusive. There may, of course, be other factors, but it's enough to give one pause when considering whether or not you should add some soy to that protein drink after your next ride.References Cited
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I urge you to not let your child or pregnant wife consume any products that contain soy. While there isn't concrete evidence as of yet, there's still enough to warrant some caution.
ReplyDeletei don't feel confident with cow's milk either - with the hormones used to get cow's to produce 10 times as much milk as they normally do. Soy milk has been a healthy alternative for us and has helped farland's congestion buidup - but we get organic, fortified soy milk and like always - moderation is key.
ReplyDeleteI agree, Cows milk is not good for you.
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