A free society with markets is really good at serving the needs/wants of most of the members of that society. Unfortunately the free part means collectively we choose what priorities our vast resources get funneled into (I'm not talking about government, but the collective effect of all of our free choices accumulating over time).  Fat people choosing to be unhealthy en masse means that as a society for the foreseeable future we will be diverting resources away from things most people used to find important, and instead focused more on obesity related problems. Obesity has consequences for us all. I'm trying to be healthy because I want to live long enough to see longevity research bear some fruit. Who knows, maybe I'll just make the cutoff and end up living for centuries and get to witness the technological golden age of humanity. Or I'll miss it by a few and die at a normal age because as a society we couldn't put down the fucking fork. Thanks fats, you're costing me a chance at immortality!