Picking up on Reg's comment about normalising obesity, it all came about during the 80's and 90's, when monster sized portions of everything: ice-cream, meals, chocolate bars, soft drinks etc became available. Noticed how small a Topic bar looks these days?
With that out went the notion of greed. It's funny, but I can't remember the last time I saw an overweight stuffing their face with a ridiculous amount of food and thought "my, you are greedy". It has become acceptable, and even normal. Even our notion of what constitutes overweight seems to have changed
I understand Kirsts point about leaving people be if they aren't affecting others, but I'm not sure it is so clear cut. I still find greed pretty repugnant.