Exercise-related changes in estrogen metabolism may lower breast cancer risk

Physical activity may reduce breast cancer risk by altering estrogen metabolism. Women who did aerobic exercises had an increased ratio of "good" to "bad" metabolites of estrogen.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/health_medicine/fitness/~3/E0fej2aaAkE/130507061143.htm

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