Soy protein contains phytoestrogens. Soy oil contains phytosterols and because soy lecithin comes from soy oil it too contains phytosterols. Therefore soy lecithin exerts estrogenic effects in the human body.
Avoid Soy Lecithin at all costs!
Bodybuilders should avoid soy protein, soy oil, and soy lecithin at all costs because the isoflavones and phytosterols. Isoflavones (also called phytoestrogens or plant estrogens ) “exert estrogenic effects directly and indirectly: directly by binding with estrogen receptors and indirectly by interfering with estrogen production.” The phytoestrogens are “similar enough structurally to act like hormones and bind with estrogen receptor sites throughout the body”. Phytosterols block receptor sites needed for testosterone. The last thing a bodybuilder or any man for that matter wants to do is INCREASE estrogen and block testosterone in their body. Estrogen (if you don’t know) is a female hormone.
Researchers at BPT had the worlds' most popular soy lecithin tested for estrogenic phytosterols and results showed that soy lecithin does indeed contain PHYTOSTEROLS, the bodybuilders' worst nightmare!!
PDF (Portable Document Format) files can be viewed