Although I have not read any research to see if concentration of obesity and low social class overlap each other, just from the amount of attention federal government has been pouring onto it, I have no doubt that you will find a heavy concentration of overweight folks among low class. This is what turns a personal problem of weight into a societal one.
Consider this — if obesity concentrate among low social class folks, they need government assistance to take care of their obesity-related health problems — heart disease, diabetes, certain type of cancer, and even higher risk of senior dementia. Hence their weight issue becomes a societal problem, making deficit-stricken government as nervous as other societal issues.
Then again as with any issues that arise from some deep-rooted cultural values and in the realm of personal behavior, if there is no change to the culture of insufficient self-control and self-discipline among the dominant obese population, no policy and government funding can bring a change in people’s eating behavior, lifestyle and do away with obesity.
It might not be politically correct to direct attention to the individual level, but be it if it is a hurting truth. This reminds me of my posting on 7/22/2010, “We Like to Cheat Ourselves with Streetlight” — we know that’s not where the truth is, still we search there because the light is good.