Scratch all that stuff that defines the where and the why, and just focus on the what. You eat produce: fruits and veggies. That alone is likely why you are much less likely to develop a lifestyle disease than those who chow down McD's. The fact that it is local farmers or organic produce is at best trivial, and likely is statistical noise comparatively.
I realize, searching around in the HN history, that this is a matter of identity for some people; I have no intention of starting another pro-con propaganda war regarding organic food in yet another thread. But can we at least concede that produce, regardless of its source and classification, is significantly better than a Big Mac and fries?
The last thing we need is for people to decide that, because they can't afford the high class choice in food -- which organics are -- they might as well not bother at all, because someone is going to heckle them for not caring about their health enough. Enough people, especially in neighborhoods like the ones we are discussing, can't decide that organic food is better for them than conventional food. The added cost may drive them into eating sufficiently little they start suffering from malnutrition. The McD's food might do that too, but if you're going to end up in poor health either way...