December 1999 Issue
Exercising for seven or more hours a week cut breast cancer risk by nearly 20% in more than 121,000 middle-aged women followed for 16 years by Harvard researchers. Women who engaged in activities like walking, bicycling and aerobics for seven or more hours a week were at nearly 20% less risk for breast cancer than women who exercised less than an hour a week. Physical activity may help reduce a woman's level
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