"Tamyka Bell" <
[email protected]> wrote in message
news:
[email protected]
[...]
> I don't know how good so much soy is for you. Everything in
> moderation, right?
Especially soy and especially for men. It's got lots of downsides to
counteract the upsides:
"In addition to its low BV score [74], soy has several other nutritional
drawbacks that make bodybuilders avoid the stuff like it was fake D-bol. One
reason soy is so low on the BV scale is it is lacking in the sulfur
containing amino acid methionine. The sulfur containing amino acids
(cysteine being the other one) are particularly important for protein
synthesis/growth, proper immune system function, and the body's production
of glutathione (GSH). GSH is one of the most important anti-oxidants found
in the body and protects cells and serves to detoxify a variety of harmful
compounds such as hydrogen peroxide, carcinogens, reactive oxygen species,
and many others. In particular, GSH is also partly responsible for keeping
low density lipoproteins (LDL) from oxidizing and clogging our arteries.
Several studies have shown soy protein to be inferior to whey for the
production of GSH and improvements in immunity. Though soy has a reputation
for reducing cholesterol in man and animals, in one study rats fed soy
protein that was not fortified with methionine as 13% of total calories, had
an increase in cholesterol and an increase susceptibility of LDL cholesterol
to peroxidation . So not only did the rats cholesterol go up, the LDL
fraction oxidized easier potentially leading to clogged arteries. It is well
established that an increased susceptibility of LDL to peroxidation is an
essential step for the development of atherogenesis. These rats were found
to have low levels of GSH and did not grow as well as another groups of rats
fed casein.
"If that were not bad enough to convince you to avoid soy, it gets worse.
Soy protein contains something known as "anti -nutrients" that block the
digestion and absorption of many nutrients. Two of the more important
anti-nutrients found in soy are Lectins and protease inhibitors. Lectins are
nasty constituents of various plants and can cause all sorts of problems
from interfering with the absorption of important nutrients to intestinal
damage. Proteases are enzymes that assist in the digestion of proteins. Soy
has several protease inhibitors that interfere with the enzyme trypsin and
chymotrypsin, both of which are important for the digestion and absorption
of proteins in the gastrointestinal tract. Finally, soy is rich in
estrogenic compounds such as genistein and diadzein. There are over 300
plant derived phytoestrogens found that vary substantially in their
physiologic effect and potency in animals and man. As any bodybuilder worth
his weight belt already knows, a change in the testosterone/estrogen ratio
in favor of estrogen can lead to increased bodyfat and other ill effects as
it relates to the strength athletes goals."
http://www.brinkzone.com/soy.html
Will goes on in that article to talk about possible upsides of soy protein
isolate (which is not just soy). However, he recently said:
"That article is a bit dated at this point and I would say if I wrote it
today, I would be a little more negative on the soy thing, at least for men
in high doses."
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