the final word on SOY PROTEIN??? Good or bad?

[Sigmund Roid]

Article about soy and steroids. It seems to protect against androgenic side-effects. For a discussion and graphs (dutch):
http://www.ergogenics.org/sojadieet.html


Food Chem Toxicol. 2003 Aug;41(8):1175-83. Related Articles, Links


Influence of dietary soy isoflavones on the accessory sex organs of the Wistar rat.

Stroheker T, Cabaton N, Berges R, Lamothe V, Lhuguenot JC, Chagnon MC.

UMR 0938 de Toxicologie Alimentaire, Ensbana, 1 esplanade Erasme, 21000, Dijon, France.

We evaluated the effects of three rodent diets differing in soybean meal content on the response of the seminal vesicles, prostate and bulbocavernosus/levator ani (BC/LA) muscle to androgens and anti-androgenic compounds in the Hershberger assay. The diets tested were (1) L5, a semi-synthetic phytoestrogen-free diet, (2) DO4, 8.5% (w/w) vegetable protein and (3) DO3, 22.5% (w/w) vegetable protein. We determined the effects of dietary soy isoflavones after ten days of exposure and in animals fed L5 and DO3 diets throughout their lifetime (including the period of treatment with androgenic or anti-androgenic compounds). After ten days of exposure, we observed no effect of diet on the accessory sex organs of male Wistar rats. In contrast, diet affected the androgenic response to testosterone propionate in seminal vesicles and prostate. Seminal vesicles were the most sensitive organs. Vinclozolin caused a dose-dependent decrease in the relative weights of seminal vesicles, prostate and BC/LA regardless of diet. As vegetable proteins may contain high proportions of genistein and daidzein, two well-known oestrogenic endocrine disrupters that may alter the results of reproductive studies, we recommend the use of a standardised open-formula diet without soy isoflavones, such as L5, if the Hershberger assay is to be performed.

PMID: 12842186 [PubMed - indexed for MEDLINE]

 

[Ganryu]

Bump for more info.

 

[ArizonaFeeds]

I agree with RADAR. you should eat a variety of protiens to include from whole foods.

 

[Mike P.T.]

they are phytoestrogens... thus they act competitively with estrogen for certain receptors... they give a "mini-tamoxifen" effect.

Agreed. As well soy has been shown to help with maintaining your metabolism while dieting.

 

[stonecold54]

good article

http://www.exercisecertification.com/articles/soyprotein.html

 

[Vectork39]

hey check out the new MD, theres a small article saying that it will not effect estrogen levels, but will not provide great muscle growth. pretty neutral if u ask me, and i like to think you did

 

[Nelson Montana]

I did an article for Musclemag a while back that was meant to be the "anti T-Mag" stance on soy. For one thing, it's only RAW soy (tofu) that has shown to have an estrogenic effect. And phyto-estrogens can very well act as anti-estrogens. The big problem with soy is that it's missing some aminos (I believe methionine is absent from all plant protein -- have to check that). So as a main protein source, it isnt tops. But a little won't kill you and as the studies Sig posted show, may have certain benefits. Besides, soy was the main protein source in supplements back in the 60's and nobody had gyno. So all this estro crap is pure paranoia and marketing B.S and T-mag spouting misinformation. What a shock.