Can non-fermented Soy products impede addition of lean muscle mass?

  • Posted by a hidden member.
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    May 23, 2007 12:16 AM GMT
    I consume a lot of soybeans and tofu as a source of proteins. I am on a vegetarian diet. I recently read that these products can also be a significant source of isoflavones [estrogen like compound or a sub-group is a phytoestrogen] and phytic acid.

    Does anyone have comments, experience that consuming soy products can interfere with testosterone levels and ability to add lean mass.

    As well, has anyone observed deficiencies of Ca, Mg, Zn, Fe as a result of interference with Phytic Acid?
  • UStriathlete

    Posts: 320

    May 23, 2007 3:52 AM GMT
    as long as you are using fermented soy you are doing the best, like tofu or soy beans/edamae. try rice protein as well, mix it up. variety is key!
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    May 23, 2007 4:17 AM GMT
    I assumed edmame and tofu are not fermented. Only miso and tempeh are the fermented forms. I do incorporate rice and variety of beans, dairy products and whey.
    With what I have read so far online I am confused about benefits of edmame and tofu [as they are considered to be complete proteins.
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    May 23, 2007 6:50 AM GMT
    I ate a substantial amount of unfermented soy products after becoming vegetarian last year. I hadn't really put much thought into it, but my desire to work out went through the floor for a few months (as did my sex drive). Being the scientist that I am, I decided to cut out most (if not all of the soy). Within 2 weeks, all was back to normal.

    Granted, that isn't a scientific study, but if the phytoestrogens are floating around in too high a quantity, it makes sense that your body will cut back in production of testosterone. That's how the checks and balances of the endocrine system work.

    I'd be wary of how much you consume. Too much of anything can be bad, and soy, while it has a variety of positive health benefits, is certainly not excluded from that line of thinking. Not enough research has been done on long-term, high doses of soy and/or phytic acid on males. It'd be a welcome study.
  • UStriathlete

    Posts: 320

    May 23, 2007 2:44 PM GMT
    If you do whey... i would stick wtih that and keep a good variety of proteins in your diet. tofu is fermented. think whole foods, nothing that is processed...edamae is a whole food. work with a nutritionists, at least get set up in the right direction.
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    May 23, 2007 4:29 PM GMT
    Thanks
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    May 23, 2007 5:04 PM GMT
    Tofu is made by boiling soybeans in water, making soymilk, and separating out the protein solids in the soymilk with a chemical coagulant. There is no fermentation involved in making tofu.

    There is, however, a wonderful, powerfully flavorful, fermented tofu called sufu.
  • metlboy

    Posts: 105

    Jun 01, 2007 3:03 AM GMT
    I eat tons of soy (in general, fermented and not) and have always stayed active and had a high sex drive.

    I always think it's odd that articles talking about side effects of phytoestrogens in soy usually recommend dairy, even though there's a ton of real (not phyto) estrogen floating around in most dairy products.