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Women can dramatically decrease their risk of developing breast cancer dietarily.
Women indigenous to the Far East are leaner and smaller, and are older at menarche, than their American counterparts. The predictive utility for breast cancer of these factors together vastly outweighs that of soy or soy-protein intake. To attribute the difference in breast-cancer incidence between Far Eastern women and American women largely to soy intake is scientifically indefensible. They may thus have the ability to prevent the binding of endogenous estrogens, which can promote tumors, to such receptors without themselves promoting tumors. Findings from some animal studies and in vitro experiments indeed suggest that phytoestrogens can serve as anticarcinogenic estrogen receptor blockers.