It's a question of what people want,

People should have a choice whether they want to engage in risky activities.

You're talking about protecting people from their own decisions,

You're talking about protecting people from their own decisions, ... What you put in your mouth and how much exercise you get, that's pretty personal.

What the anti-fat activists are saying is, people don't want what they ought to want, and therefore the government has to coercively change what they want.

Like most drugs, their benefits outweigh the costs for most people. I'd rather be driving next to a truck driver on speed than a truck driver who's falling sleep.