One of the first things that strike foreigners visiting the U.S. is that the rich tend to be skinny and the poor fat. Studies bear this out. The less money you have in America, the likelier you are to be overweight. One in 4 adults below the poverty level is obese, compared with 1 in 6 in households with an income of $67,000 or more. For minorities, poverty has an even heavier effect: obesity strikes 1 in 3 poor African Americans.
On the surface, this makes little sense. If the poor must struggle to buy groceries, how can they pack away...
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