The problem being that if personal responsibility is somehow taken out of the equasion, when obesity becomes a 'disease' rather than the direct result of choices an individual has made throughout their life (again, I'm slightly over-generalizing here, not taking into account people with genuine medical reasons behind the condition), what you now have is yet another expense that must be picked up by the American taxpayer. As you mentioned earlier, it is often the poorerest segment of the population that has the highest rates of obesity. Guess who is paying for their healthcare?
No, I don't support additional taxes on high fat foods. But when you hear about situations like those mentioned in post #90, it seems clear that something is out of whack.