Soy foods, such as tofu, soy meat substitutes, soymilk, soybeans and soy ice cream contain chemicals called isoflavones that bind weakly with estrogen receptors on the male reproductive system. Most studies showing negative effects on the male reproductive function used animals. A study found that men who ate two servings or more a week of soy foods had lower sperm counts than men who ate less soy. The soy had no effect on ejaculate volume, sperm structure or sperm activity. The most effected were obese men. The effects of soy protein on male reproductive function and testosterone levels are highly controversial.

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