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Heading for middle age? Bring your sneakers to cut breast cancer risk
Heading for middle age? Bring your sneakers to cut breast cancer risk

For women past childbearing age, a new study finds that a modest amount of exercise -- four hours a week of walking or more intensive physical activity such as cycling for just two hours a week -- drives down breast cancer risk by roughly 10%. If exercise were a pill, its effectiveness in driving down a woman's breast cancer risk would occur fairly quickly, the new research says: When women reported at least this modest level of physical activity over the last four years, they were less likely to have developed malignancy in a breast. But, like a pill, exercise must be continued for the effect to endure: Even if a woman had been physically active earlier in life, when her reported...