Soy consumption alters endogenous estrogen metabolism

Posted by Chantel M. Contributed by US National Library of Medicine National Institutes of Health

In the study to investigate whether Soy consumption alters endogenous estrogen metabolism in postmenopausal women, posted in PubMed, showed that Compared with the soy-free baseline and very low isoflavone control diet, consumption of 65 mg isoflavones increased the urinary 2/16alpha-(OH) estrone ratio, and consumption of 65 or 132 mg isoflavones decreased excretion of 4-(OH) estrone. When compared with baseline values, consumption of all three soy diets increased the ratio of 2/4-(OH) estrogens and decreased the ratio of genotoxic: total estrogens. These data suggest that both isoflavones and other soy constituents may exert cancer-preventive effects in postmenopausal women by altering estrogen metabolism away from genotoxic metabolites toward inactive metabolites.

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