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Soy Protein and Testosterone

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romeshw
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2008/05/19 12:43:47 (permalink)
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Soy Protein and Testosterone

Hi all,

I've found some conflicting information regarding the effect of soy protein on testosterone levels:

Reduce your intake of soy. Soy protein raises the body’s levels of estrogen (the main female hormone) and this has a direct negative effect on testosterone levels.
http://www.24hrfitness.co.uk/bodybuilding/increase-testosterone.html

The researchers concluded, "This investigation shows that 12 week supplementation with soy protein does not decrease serum testosterone or inhibit lean body mass changes in subjects engaged in a resistance exercise program."
http://www.poweringmuscles.com/sports_science.php?id=20

Having just bought 2kg of Soy Protein, I'm curious to know your thoughts on this?
#1

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    YumPies
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    RE: Soy Protein and Testosterone 2008/05/19 12:58:19 (permalink)
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    Phytoestrogens -
    Some sources say they have health benifits, others say they're the devil and reason why we had world war II.

    I based most of my protein intake around soy(TVP) and although im not completely happy (because all this phytoestrogen talk) in the bigger scheme of things i really doubt it will have much if any effect.
    The increased protein in my diet will probably help me more than the little estrogen that may or may not have effects on us.

    #2
    anabolicjay
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    RE: Soy Protein and Testosterone 2008/05/19 12:59:58 (permalink)
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    i dont buy into the theory that it reduces T-levels and gives you bitch tits, the effect they will have on the HPTA is neglible.
    Although i dont like quoting pubmed:-
    http://www.ncbi.nlm.nih.gov/pubmed/15735098 -In conclusion, soy protein, regardless of isoflavone content, decreased DHT and DHT/testosterone with minor effects on other hormones, providing evidence for some effects of soy protein on hormones. The relevance of the magnitude of these effects to future prostate cancer risk requires further investigation
    http://www.ncbi.nlm.nih.gov/pubmed/11352776 -We conclude that the phytoestrogen dose consumed had no effect on semen quality


    also iirc nuts and seeds have more phyto-estrogen content iirc flax has the highest but no one seems paranoid about using this?

    Edited so it makes sense
    post edited by anabolicjay - 2008/05/19 13:01:31

    The tattoo does not hide the skin, it reveals the nature of the man...

    #3
    romeshw
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    RE: Soy Protein and Testosterone 2008/05/19 15:15:49 (permalink)
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    Thanks for the responses. It does seem that people were worried about soy's impact on hormones, but more recent research seems to overrule that.

    Soy's a good fit for my needs, nice to know I won't necessarily grow women's bits by taking it!
    #4
    theiopener
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    RE: Soy Protein and Testosterone 2008/05/19 15:17:07 (permalink)
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    Veganlifter doesnt look like he has a testosterone problem somehow

    Nor daveo
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    Drew Price
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    RE: Soy Protein and Testosterone 2008/05/19 17:27:58 (permalink)
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    The problems with trying to get qualitative and quantitative information on this issue are:

    1) there are different types of soy products (the ones we're eating now are relatively new, not the traditional type)
    2) There are 2 main types of phytoestrogen involved and they have different actions.
    3) There is a certain amount of processing in the gut - everyone has slightly different gut flora and this alters it.
    4) The effects differ on from between men and women and between individuals greatly.

    If you look at a lot of research it says there is little effect and anecdotally many people agree. However as an example to make you think; if it were all overblown nonsense why would the medical community (specialists like oncology registrars, not quack therapists) strongly recommend that women is insulin sensitive tumors* avoid soy products. Why? Because there is a great deal of evidence to support the theory that in this example soy can have a profound estrogen type effect.

    The fact is this, soy is used all over the place in foods and the long term effects of the newer minimally processed types of product is not understood. Not even a little. That;s before you considered it in conjunction with all the other xenoestrogens present in water, plastics, glues etc.

    It all comes down to this: variety. You can have soy but you shouldn't rely on it - this is the same for most foods.

    *these are breast tumors in post menopausal women who produce very little estrogen, the rate of tumor growth is increased by estrogen.
    #6
    Drew Price
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    RE: Soy Protein and Testosterone 2008/05/19 17:34:27 (permalink)
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    ORIGINAL: anabolicjay
    iirc flax has the highest but no one seems paranoid about using this?


    This is again where there is some confusion.

    The have compounds that bind to the estrogen receptor on your cell but their effect (power to switch it on) is far less than that of estrogen so in this way it blocks estrogen. The idea goes that if you have too much estrogen it will diminish the effects if you have too little it will increase the estrogenic effects. This would be hard to quantify.

    There is a phytoestrogen in soy that does a similar thing.

    more reading here...

    It's a few years old now. Excuse the spelling mistakes.....

    http://www.drewprice.co.uk/essays/modernsoyuse.pdf
    #7
    Maximise
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    RE: Soy Protein and Testosterone 2008/05/19 19:54:38 (permalink)
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    Sounds like some of the testosterone reducing talk is not proven and is Chinese whispers me thinks! Lol I don't use it though, just because because i dont like the taste! Lol
    #8
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