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post #1 of 6 (permalink) Old 05-03-2003, 05:29 PM Thread Starter
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Soy protein?

From what I understand, soy protein is mainly for women, right? Will it do any good for a man?

What happened is my wife decided that she needed to take protein too since she has a low protein diet. So I went and bought her $20 of protein and she hates it. She says that she can't even gulp it down. So do I have to throw away the $20 or can I just take it?
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post #2 of 6 (permalink) Old 05-03-2003, 05:50 PM
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I had a friend tell me something about soy protein and how men's bodies don't like it .... or something like that. It messes with your body man!
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post #3 of 6 (permalink) Old 05-03-2003, 07:06 PM
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Copied this from another board:

Soy protein BAD, I don't think so.

Recently, an article was written by a certain Net Magazine, claiming that soy protein was a "Bad" Protein to use if you were a bodybuilder looking to add lean muscle mass. The article concluded with the use of research studies, that soy proteins' phytoestorgens actually lowered testosterone production in animal studies. Hence lower testosterone levels, higher estrogen levels, no muscle gains.

But of course there are always two sides to the story, and I think I have a better case, jury listen up!!!

I would have to disagree, and nutritional experts agree, that soy protein is an excellent protein to use if you're a bodybuilder using the protein to gain muscle mass. Here are a bunch of reasons.

Hormonal Studies

1) A study found that soy protein isolate (daidzein) may have a gender specific normalizing effect on sex-hormone prduction. Male lab animals experienced greater testosterone and growth-hormone excretion as well as muscle growth" This contradicts the study that found that genestein decreased testosterone serum.

2) Another study found that soy may be actually antiestrogenic. . They may also act as antiestrogens by competing for the binding sites of estrogen receptors or the active site of the estrogen biosynthesizing and metabolizing enzymes, such as aromatase and estrogen-specific 17 beta-hydroxysteroid oxidoreductase (type 1).

3) Probably the best research study contracting the one used by the author of "The bad protein" is this.

The phytoestrogens are only found in raw soy products. Not soy protein isolates, which are used as protein supplements for bodybuilders.

"There are very little data on effects of phytoestrogens in males. Estrogenic effects in wildlife have been described but the evidence for the role of phytoestrogens is indirect and seen under conditions of excessive exposure."

And what is most interesting about this study is that it was conducted by one of the same researchers at the same univeristy as the study that found genistein lowered testoserone serum levels. This researcher concluded that even though he found genestein has estrogenic effects, it really cant be concluded because of the above statement in his other reasearch findings. Hence, he found soy to be estrogenic, but it really cant be "hard" evidence because there is not enough proof and it involves ridiculous conditions.

See what I mean by two sides to every story..

Positive Benefits of soy

1) The amino acid profile of soy is excellent. If you don't know by now the Glutamic Acid level is higher than whey. Why? Mainly because it is a plant protein and not dairy.
2) Soy has been proven to lower heart disease risks and cancer. Now there are about a million studies on this statement. I not going to quote any.
3) Soy protein actually improves kidney function.
4) When soy was combined with a carbohydrate in comparison with casein. Lower bodyfat gains were observed.

Character witnessess

1) Dr. Mauro Di Pasquale , probably one of the greatest sports nutritonist authors to ever live. (and trust me on this one) quoted in Muscle Media Magazine. "I use a combination of soy, casein, and whey protein that I make up myself from three different products, each one containing on of the protein isolates in quality form"
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post #4 of 6 (permalink) Old 05-03-2003, 07:13 PM
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Soy protein is made by extracting soy flour under slightly alkaline PH followed by precipitation, washing and drying. It offers excellent dispersibility. By using this process soy yields a protein of over 90%, hence given the tittle of soy protein isolate. It also has a high content of BCAA and glutamine and arginine.

Protein 90%
Moisture 5.5%
Fat max 8%
Fat (hydrolysis) max 4.5%

Amino Acid Profile
Histidine 2.3 Isoleucine 4.3
Leucine 7.2 Lysine 5.5
Methionine 1.2 Phen 4.6
Threonine 3.3 Tryptophan 1.1
Valine 4.4 Glutamine 16.8

Bodybuilding and Athletic Supplementation Description

Soy protein is quickly again becoming popular amongst the bodybuilding community. The reason RESEARCH! Here is what research has discovered about soy isolate.

1. Soy fights cancer and has anti-estrogenic effects.
2. Soy has the highest amount of BCAA glutamine and arginine.
3. Soy may raise the level of endogenous production of thyroxin, which in turns speeds up metabolism.
4. Daidzein, one of soy's isoflavones, may raise the level of testosterone and growth hormone.
5. A diet rich in soy decreased the chance of heart disease.

Soy protein is considered a must in a bodybuilders diet. Due to extreme low cost, bodybuilders experience great gains in muscle mass and decrease in body fat

So, 5111 use it up with no discretions!
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post #5 of 6 (permalink) Old 05-03-2003, 10:40 PM Thread Starter
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Thanks wicked, that is what I was looking for!
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post #6 of 6 (permalink) Old 05-08-2003, 01:12 PM
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Soy is great if you enjoy farting.
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