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Whittle your waist

Obesity is linked to colon-cancer risk, especially for men. And there's some evidence that abdominal obesity—aka belly fat—may be the key factor.

Men under 50 with excess fat around their middles are just as likely as thinner men older than 50 to have precancerous cells in their colons, according to a 2010 study.

Since big bellies increase the risk of a host of other diseases, from heart disease to diabetes, there's no downside to reducing your waistline.

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