Does soy lower testosterone signinficantly?

http://timinvermont.com/soyvswhy.htm
"Daidzein is a key isoflavone found in soy that acts as a potent phyto-estrogen. It is structurally a very weak "pseudo-estrogen" (about 1000 times weaker than the body's primary estrogen estradiol). This is good news to the bodybuilder because weak estrogens like daidzein will compete with stronger estrogens like estradiol for available receptor sites to "bind" to. By binding to the receptor sites daidzein then "blocks" the stronger estrogens from binding to and activating receptor sites. With the daidzein isolflavone attached, estrogen receptor sites remain inactive. This inactivity further minimizes the negative effects of estrogen in the body. Many researchers believe this effect is the reason soy protein is linked to a reduction in the risk for many forms of breast, endometrial, and prostate cancer. This mechanism works similarly to the prescription drug Nolvadex (tamoxifen citrate)--an anti-estrogen staple in the bodybuilding community."
This article was linked a while back on this forum, Ican't remember who posted it.
 
Ruhl, spending your time worrying about every little thing is potentially worse than anything soy could ever do to you.
 
[b said:
Quote[/b] (Ruhl @ Nov. 17 2003,10:51)]http://www.menshealth.com/cda/dailytip/0,6923,H-281,00.html
Is this correct? I am concerned because I get my protein from a soy protein isolate powder.
Click to expand...
if i remember correctly, the problem with a straight up comparison of soy to beef is that they don't correct for hte higher zinc of beef. if that is your main source, and switch to soy makes you zinc-defficient, then it could affect testrosterone.
 
Ruhl, regardless of my opinion about soy foods, you should not worry about taking soy protein isolate in the slightest.

The article was about soy foods, which are non-processed and lightly-processed versions of soybean, containing many natural elements from the bean, including phytoestrogens. Soy protein isolate, on the other hand, is just the isolated soy protein, with effectively no phytoestrogens.
 
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