Men who exercise consistently have much lower rates of prostate cancers. For example, the Harvard Alumni Study found a significantly reduced risk of prostate cancer among men who exercised more than 4,000 kcal (kilocalories) a week and an increased risk for men who expended less than 1,000 kcal a week. The risk was nearly 50 percent lower for men over seventy and more than 80 percent lower for men under seventy.
(A kilocalorie is the same amount of energy as a calorie, except that we use the term "calories" when we're talking about food and "kilocalories" when we're talking about exercise.).
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