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"You are directly responsible of what you put in your mouth everyday, and how much of it."Well, yes, technically. Of course, you're conveniently forgetting about the effects of pricing, geographic proximity (seen many organic produce stands on skid row lately?), culture, education, and most importantly: time.
> "Most of the obese epidemic is lifestyle related"
And yes, you're right, but only in the most technical and of ways. Of course the obesity epidemic is lifestyle-related, but that's not what we're on about. We're on about a system that punishes healthy lifestyles and makes them unreasonably difficult for the poor to attain - harder than any of us pansy-ass rich folk have to contend with.
Let's re-enumerate very quickly:
1 - Eating too much is not the issue. Eating too much of the wrong things is the issue.
2 - Unhealthy foods are cheaper than fresh fruits, veggies, and meat by an almost comically large margin. This is due to a number of causes, most saliently massive government subsidization of unhealthy food industries.
3 - Time is the scarcest resource, and the poor have the least of it, and the least to spare towards maintaining a healthy lifestyle (which, despite what you might insist, is a time-intensive activity).
3a - The poor are disadvantaged in choice of living space. My commute is an order of magnitude shorter than what it'd be from the nearest poor suburb. I pay for the privilege, and it earns me easily an extra 1.5h each day.
3b - The poor are disadvantaged in transportation. While most people simply hop on a car between A and B, the American poor spend an enormous amount of time navigating the clusterfuck that is North American public transit. Here in SF, even with its good-by-American-standards transit system, transit anywhere takes about twice as long as it does in car.
3c - The poor are disadvantaged in just sheer lifestyle. You might live next to a nice park where you can jog after work - what do the poor have except crime-ridden streets?
This is the thing I can't stand about this line of argument, not only does your position fail to account for the many, many ways the cards have already been stacked against the poor, but it also fails to appreciate just how many natural advantages you and I enjoy in every day life. It's a combination that really irks me: the failure to appreciate one's own good fortune, and conversely the willingness to blame others for not having such good fortune.
Side note: time really is the deciding factor in just about anything poverty-related. Part of the reason for the persistence of homelessness (disregarding even bigger fish like mental health and substance abuse) is that the homeless spend the majority of their day queuing for resources. They spend hours lining up for a meal. They spend even more hours lining up for a bed. 98% of their waking hours is spent ensuring the status quo (i.e., homeless, but unlikely to die tonight), with nothing left to make actual, lasting improvements. This same problem applies to the poor and dietary habits.