A walk a day keeps cancer away

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Three hours a week--that's how much exercise it takes to cut ovarian cancer risk, say researchers at the Public Health Agency of Canada in Ontario.

After querying 442 ovarian cancer patients and 2,135 healthy subjects regarding 12 typical leisure activities, the researchers found that women who did moderate exercise--like brisk walking, playing golf, or bowling--for 30 to 60 minutes, 5 times per week were 30% less likely to get ovarian cancer than women who did less. Howard Morrison, PhD, senior science advisor at the agency, has a possible explanation: Women who exercise produce less estrogen, the hormone may spur ovarian cell growth that leads to the cancer.

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By Julie D. Andrews

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