Postmenopausal breast cancer risk decreases rapidly after starting reg. physical activity

( American Association for Cancer Research ) Postmenopausal women who in the past four years had undertaken regular physical activity equivalent to at least four hours of walking per week had a lower risk for invasive breast cancer compared with women who exercised less during those four years, according to data published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American …