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Go down to the ghetto. Try to find fresh food. You'll find convenience stores where you can buy Cheetos and beer. But what if you want fresh chicken, whole wheat flour or broccoli? How do you buy those if you live in the inner city?
What you do is get on a bus and shop in a more affluent part of town. If you don't have the time or energy for that, then you live on cheap convenience store carbs and get fat.
Obesity is not a measure of prosperity for the poor. It is a consequence of economic inequality.
One good thing they're doing in LA is installing small public mini-gyms featuring cheap, durable versions of equipment found in gyms the poor and too poor to join.
But it's still hard to get supermarkets to open up in those areas. People still have to take the bus to a more affluent neighborhood if they want broccoli.