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Thread: Soy Protein Isolate

  1. #1
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    Default Soy Protein Isolate

    I was reading about Soy proetin Isolate actually being benificial to bodybuilders, even much better than whey proetin or calcium cassinate as a slow digesting protein. It has more BCAA's and more glutamine per gram than any other proetin out there. And with the isolate, the isoflavones are not present, they are taken out, so you don't get teh estrogenic effects of soy proetin that you do from other soy products. It also says that soy proetin isolate can help yoru thyroid while dieting. ANy truth to all this, would you reccommend it? I have always used Ion Exchanged Whey and Calcium casinate mixed together, just wanted to try somthing new so my body has some new proetin to digest. Thanks
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  2. #2
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    Default Re: Soy Protein Isolate

    Originally posted by The Myth
    I was reading about Soy proetin Isolate actually being benificial to bodybuilders, even much better than whey proetin or calcium cassinate as a slow digesting protein. It has more BCAA's and more glutamine per gram than any other proetin out there. And with the isolate, the isoflavones are not present, they are taken out, so you don't get teh estrogenic effects of soy proetin that you do from other soy products. It also says that soy proetin isolate can help yoru thyroid while dieting. ANy truth to all this, would you reccommend it? I have always used Ion Exchanged Whey and Calcium casinate mixed together, just wanted to try somthing new so my body has some new proetin to digest. Thanks
    It does have more BCAA: true. However, it has show to increase estrogen levels - not directly but in the long-run it does. I suggest against it....

    Mr.X

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    Default

    Where did you read this? I would like more info on it as well.
    "IF" it is not estrogenic, then yes, it could possibly be good for you. This is the first I have ever heard of this though.

    Thanks.

  4. #4
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    Default

    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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  5. #5
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    Myth,

    If this doesn't help you, I don't know what will lol...

    http://www.ncbi.nlm.nih.gov/entrez/q...arch&DB=PubMed

    Mr.X

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    I probably aint gonna touch it either, but I was thinking more of my kids. I can get them to drink those Spirutein protein shakes, but they are VEGAN/soy so it has me concerned, thats all.

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    Originally posted by Icarus
    I probably aint gonna touch it either, but I was thinking more of my kids. I can get them to drink those Spirutein protein shakes, but they are VEGAN/soy so it has me concerned, thats all.
    I would consult w/ a doctor before giving your kids that - remember, some kids have natural allergies to soy and such, so my best advice is to consult w/ their doctor.

    Mr.X

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    Thanks Mr. X. I have had it checked out. My son has a whey allergy (as do I) so that is why we started giving him the soy in the first place. Then I found out about the phytoestrogens.
    Damned if you do, damned if you don't. It sucks.
    His mom is a vegetarian, so she has the stuff anyway, and it has all of these fruity "Snapple-icious" flavors, so he drinks it (he is only 4).
    We have limited him and our daughter to one serving a day (split into two drinks) and they seem to be fine.

    Thanks for the advice.

  9. #9
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    Originally posted by Icarus
    Thanks Mr. X. I have had it checked out. My son has a whey allergy (as do I) so that is why we started giving him the soy in the first place. Then I found out about the phytoestrogens.
    Damned if you do, damned if you don't. It sucks.
    His mom is a vegetarian, so she has the stuff anyway, and it has all of these fruity "Snapple-icious" flavors, so he drinks it (he is only 4).
    We have limited him and our daughter to one serving a day (split into two drinks) and they seem to be fine.

    Thanks for the advice.
    I think at a young age, some soy wont be a big proble. however, an overload of soy intake will eventually catch up to one.

    You should be fine and so should he

    Mr.X

  10. #10
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    yeah soy os nasty. thats for chinease folks not for us white folks
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