FAT CITY: Time Out New York (via Gawker) gives us a handy chart of every neighborhood in the five boroughs, and what percentage of the residents are obese. According to the survey, the thinnest neighborhoods in New York City (at under 10%) are the Upper West Side and Upper East Side of Manhattan, as well as Gramercy Park and Murray Hill, while the fattest (at 32%) are East Harlem in Manhattan and Bedford/Stuyvesant and East New York in Brooklyn.
The implication is obvious: the richest neighborhoods in the city are also the thinnest, while the poorest are the fattest. I can't think of a good sociological explanation for why, but we can glean one conclusion from the results: thinness is more likely to result from anorexia than from poverty.