Does exercise reduce breast cancer risk?

The incidence of breast cancer is more than one third lower for women who exercise regularly than those who do not exercise regularly. Studies from Norway, Japan, Canada, and the United States found that women who exercised were 20 to 44 percent less likely to get breast cancer. Some scientists hypothesize that women who exercise more have lower fat stores and, hence, less long-term exposure to impurities stored in fat cells, less storage (in fat) of compounds that stimulate estrogen receptors, and less inflammation.

Others hypothesize that endurance training helps increase the number of immune system cells that are known to kill off potential cancer cells and reduce inflammation. And again, in studies of Breast cancer risk, even non-intense exercise has relatively immediate and long-lasting benefits. In a Los Angeles study, woman who did any physical activity, even 20 minutes of walking daily, had a 38 percent lowered risk of early stage breast cancer.

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