No legitimate scientist or company claims that soy protein cures or prevents cancer at this point, but the research data is very positive that soy can promote better prostate health. Evidence from over 40 studies suggest that a diet rich in soy protein plays a substantial role in the promotion of healthy prostate function. Many experts feel that dietary soy plays a role. In fact, the areas of highest soy consumption exhibit the lowest mortality rates from prostate cancer. Asian men have much lower incidences prostate cancer compared to Western men.
Asian cultures have dramatically lower prostate cancer death rates than Western cultures.
Soy isoflavones are naturally occurring nutrients within soy. Additionally, soy has been shown to inhibit enzymes and hormones that stimulate prostate cell growth. Studies are now being done on humans to see if this same positive effect occurs. In summary, soy can help promote healthy prostate tissues while lowering risk of heart disease for men. Given soy's numerous heart, prostate, colon, weight and muscle benefits, men with or without a history of prostate problems can benefit with the simple addition of soy to their diet.