There are societies, esp. in the western part of the world, where obesity becomes a NORM, so being shamefully fat becomes an "ok" thing, and geez, I swer - in some countries, with that situation, fat females feel GREAT, and GOOD about themselves, while in fact they look fukkin disgusting and let go themselves completely. The TOLERANCE that arises is out of pure fact - "He looks as fat as me, I tolerate him/her." another person thinks the same, they all start to feel good and careless, it's a "anorm", so the obesity evolves to a new level.
Now - take that fat bitch or a fella (for a female it's worse) and put her in a society that's relatively fit and despises being fat (which is NORMAL AND HEALTHY outlook), where a larger percentage of people look great and are if not in shape - at least not obese. You'll see how soon that happy/careless/tolerant fat bitch will turn into a self conscious person, who'll suddenly realize that it's not that "normal" to be fat, and maybe not even healthy (what a surprise!). In a society she's from, where many people are fat and tolerate each other it's all dandy, but in this society wherte fatness is frowed upon (Italy, France, eastern countries, etc..) - she'll be consedered a "second class people" and feel it very well. That's a good therapy for all these fatties who think it's ok to hog on food wven when you are predisposed to be obese, and it's a no biggie to use the tax payers money for their cure of diabates, CVD, etc.. later on.