This idea that people who are overweight are simply gluttonous and lazy reminds me of the quote from Alice in Wonderland:

speak harshly to your little boy
and beat him when he sneezes
he only does it to annoy
because he knows it teases

The thing that really gets me about this kind of thinking is the undercurrent that we, the fat folk, are somehow wantonly making the fit folk's lives worse by stubbornly choosing to be (lazy, lying) fat folk. I mean isn't the one who is carrying the weight pretty much the one who suffers most for it (airplane seats aside)? And we won't even go into thin, unhealthy people, let alone fat, fit ones. Don't we all know that thin=healthy=morally good?