Article: Calories for dummies.(explaining daily calorie requirements)

Calories. Two out of three American adults need to eat fewer. The rest struggle not to eat more. And we're not talking about cutting back enough to--maybe--live longer (see cover story). Most people would be happy to avoid going up a clothes size every few years.

But what does it mean to cut back to--or stay at--1,500 of 2,000 of 2,500 calories? Most people have no idea.

That never used to be as much of a problem. Calorie-dense food didn't lure us at every shopping mall, gas station, amusement park, and fast-food joint. Portion sizes were sensible, not a contest by restaurants to offer more indulgence than their competitors.

But all that has ...

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