Of course it would "work" in the sense that taking away people's freedom to eat unhealthy food would generally make them healthier. That doesn't make it right to do. It would also "work" to chase fat people around with sticks all day. I don't like the idea of restricting people's personal choice to force them to be more healthy. If I, fully informed of the consequences, want to buy soda and twinkies, I should have the full right to do so and not have it made economically unviable due to ridiculous fees and taxes.