K-hookers grow up with different diets, genetics, metabolisms etc. Let's cut the American women some slack. This is a pretty unhealthy food culture and by the time a lot of women figure that out they've developed a bigger look. I agree that if you're going to sell your body it should be the best product you can deliver. But years of bad eating (usually the parents fault) is pretty hard to overcome.
Some people figure out how to eat properly for their bodies and they don't suffer the same problems.