Nothing wrong with the basic gist, but read closely the statement I quoted. Just because something takes a long time to kill you doesn't mean its treatment is expensive. Similarly, just because something is expensive to treat doesn't mean enough people have it to make it worth targetting from an overall cost perspective. That's all I was saying.

And if you get less deaths per person-years, you might also save money (per person-year).

Diabetes - blindness, circulation problems, infections, amputations. It's not at all clear that health care for fat people would be less than for thin people.