As the question of soy phytoestrogens has come up a few times, I thought some folks might find this quote from Dr Sears Zone interesting:
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Significant processing of soy protein generates either soy protein concentrates or soy protein isolates. Most soy imitation meat products use soy protein concentrates as their primary source of protein. With either type of processed soy protein, the phytates that can bind minerals (especially zinc) are removed. Likewise, the protease inhibitors and haemagglutinins are deactivated by the heat treatment that is part of these more advanced processing technologies. The primary difference between the two types of soy protein is that the phytoestrogens have been completely removed from the soy protein concentrates by alcohol extraction, whereas about one-half of the original phytoestrogens remain in the soy protein isolates, which are water extracted. This is why I recommend at least one-third of your soy protein intake be in the form of soy imitation meat products, which are composed of phytoestrogen-free soy protein concentrates so that the daily phytoestrogen intake doesn’t exceed 50 mg per day.</div>
I have actually seen an article (Whey vs Soy) supposedly published originally on Elite Fitness (a heavy steroid-use web site) that maintains soy protein is the best for body building and that the weak phytoestrogens compete with the 1000x stronger natural estrogens for binding sites. In essence, acting like Nolvadex! Elsewhere, this is dismissed as only being of some benefit if you are on a specific anti-aromatase routine. Can't say which is correct, but it is interesting.
I do think that the recommendation to stay below a certain level of soy phytoestrogens per day is prudent. But, the controversy goes on ...
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Significant processing of soy protein generates either soy protein concentrates or soy protein isolates. Most soy imitation meat products use soy protein concentrates as their primary source of protein. With either type of processed soy protein, the phytates that can bind minerals (especially zinc) are removed. Likewise, the protease inhibitors and haemagglutinins are deactivated by the heat treatment that is part of these more advanced processing technologies. The primary difference between the two types of soy protein is that the phytoestrogens have been completely removed from the soy protein concentrates by alcohol extraction, whereas about one-half of the original phytoestrogens remain in the soy protein isolates, which are water extracted. This is why I recommend at least one-third of your soy protein intake be in the form of soy imitation meat products, which are composed of phytoestrogen-free soy protein concentrates so that the daily phytoestrogen intake doesn’t exceed 50 mg per day.</div>
I have actually seen an article (Whey vs Soy) supposedly published originally on Elite Fitness (a heavy steroid-use web site) that maintains soy protein is the best for body building and that the weak phytoestrogens compete with the 1000x stronger natural estrogens for binding sites. In essence, acting like Nolvadex! Elsewhere, this is dismissed as only being of some benefit if you are on a specific anti-aromatase routine. Can't say which is correct, but it is interesting.
I do think that the recommendation to stay below a certain level of soy phytoestrogens per day is prudent. But, the controversy goes on ...