Can physical activity help prevent cancer?

In a study of 13,000 men and women, measuring their fitness and following them over the course of eight years for their experience with cancer, researchers found that the least fit men and women had twice the deaths from all cancers compared with the next-to-least fit group. Because improved physical fitness is at least in part a result of increased physical activity, it's probably safe to conclude from the findings that increasing physical activity is beneficial. However, it's not clear from that study whether the cause of the reduced cancer deaths among the most fit was their fitness -- we think it is -- or whether they pursued other health habits such as eating a low-fat, high-fiber diet, not smoking, and so on, all of which may have reduced their risk.

Most likely, the most fit were the most physically active, and the most physically active would probably tend not to smoke, significantly reducing their risk of lung cancer. The most fit might also be more likely to eat foods low in fat and high in fiber, dietary habits that might reduce their risk of colon and some other cancers.

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