Another thing is to remove the ability to purchase junk foods and cola with government food assistance. There's an extreme inverse correlation between obesity and income (hah.. imagine people of a couple hundred years ago hearing that) and so steps like this could actually have a tremendously positive overall impact on overall social health and wellbeing. This is even more true when you consider that twinkies and cokes are being bought on strictly limited budgets which means that much less money (and now more) for healthy foods.