Today's incentive to exercise...

You think your belly fat makes you crazy now?

A potbelly in middle age more than triples the risk of senility decades later, according to a large study that pinpoints a new link between obesity and dementia.

"The take-home message is that it's not only what you weigh, but it's where you carry your weight in midlife," said study author Rachel Whitmer, a research scientist with the Kaiser Permanente Division of Research, in Oakland, Calif.

The good news? Lose weight, and you may be able to reduce the increased risk, she said.

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