Obesity should be taxed, but indirectly. Taxing people with an eating disorder seems mean. Let's nudge them in the right direction by adding a massive federal healthcare tax to sugars at the wholesale level. Let's see how many Oreos you eat when they go from $2 to $20 per box.

This is politically challenging because people hate taxes and farmers & processed food companies like money and they're organized. That said, we managed to tax cigarettes despite tens of millions of smokers and plenty of tobacco farmers and even RJR Nabisco.