Soy Protein & Bodybuilding

July 5th, 2007 by Paul Johnson

Soy Protein is a very common protein for vegetarians and other health enthusiasts. But how good is it for Bodybuilders?

About Soy Protein:

Soy protein comes from soybeans. At one point soybean plants were used for fertilizer. In the 1970's the soy companies started to try and change its reputation. United Soybean Board (USB) has spent millions of dollars since the 70's to lobby and promote Soy, even though it is really a terrible source of protein.

Negatives of Soy Protein:

Soy Protein increases your estrogen levels through Phytoestrogens, which mimic estrogen. The Phytates in Soy also block the uptake of minerals. Soy protein also has enzyme inhibitors, making protein digestion more difficult. It also contains Haemaggluttin, which increases red blood cell clumping and inhibits oxygen uptake and growth.

As a bodybuilder the last thing you want is something that raises your estrogen levels. Estrogen promotes fat gain, feminization, and certain cancers. It also doesn't contain the dozens of immune enhancing and anti-cancer subfractions that Whey protein contains.

  1. Soy bodybuilder on August 25th, 2009

    Phytoestrogen means “plant estrogen,” which every plant has. Soybeans do not “increase your estrogen level.” That’s ridiculous.

  2. Dr. Satyajeet Sharma on July 8th, 2010

    Phytoestrogens are thought to compete with natural estrogens for estrogen receptors on cells. By binding to the receptors, phytoestrogens prevent estrogen from stimulating certain tissues and theoretically lower the risk of developing cancers that are spurred by estrogen. Isoflavones are much more potent than lignans when it comes to interacting with estrogen receptors in the body.

  3. Drew on December 13th, 2010

    …Your negatives of Soy beans is completely off!

    To start, yes soybeans contain phytoestrogens. However in all health studies done they show the same conclusive result that it does not effect human hormonal levels what so ever. It goes threw the body and out the urine.
    The Haemaggluttin is also very insignificant in amounts to do anything harmful.
    “It also doesn’t contain the dozens of immune enhancing and anti-cancer subfractions”. Thats definitely the best of the three. It contains all the amino acids! It is very antioxidant, much more then whey protein!