obesity epidemic

The Unusual Suspects

Researchers are uncovering some pretty strange culprits behind the obesity epidemic—everything from air-conditioning to infectious love handles

Obesity is our century's version of the Kennedy assassination: Everybody's got a theory. But even with blame perpetually shifting -- one day it's fast-food corporations, the next it's genetics -- and a $40-billion-a-year diet industry, our waistlines just won't stop expanding.

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