We know that regular exercise helps reduce the risk of breast, colon, esophageal and kidney cancer, and now researchers at the U.S. National Cancer Institute (NCI), a branch of the National Institutes of Health, suggest that daily physical activity cuts the risk of endometrial cancer, as well. The NCI researchers analyzed 14 earlier studies and concluded that exercise reduces the risk of endometrial cancer by 20 to 40 percent. One of the studies included showed that 20 minutes of vigorous exercise five times a week could reduce the risk by 20 percent; another showed that women who spent more than nine hours a day sitting had twice the risk of developing endometrial cancer compared to women who sat fewer than three hours a day. One theory of how exercise helps is related to its effects on body fat. (Fatty tissue contributes to elevated estrogen levels that could, in turn, increase cancer risk). The study was published online on September 29 by the British Journal of Cancer.
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