The staff of TIME's science section has had to put up with a lot of ribbing lately as we put the finishing touches on this week's issue. There's something about being overweight--or, as it turns out, writing about people who are overweight--that seems to bring out the comedian in everyone. But obesity in the U.S. is no laughing matter, and as we've watched the country's waistline grow over the years, we've struggled with how to cover what has become America's greatest health challenge. It wasn't enough anymore to just describe the problem. We needed to know if anyone had any good...
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