Its possible that with all of the 'Fast foods' available that over consumption of such can cause obesity, I also think that the amount of chemicals/hormone drugs pumped into animals bred for consumption have something to do with this. Because of overpopulation there is a larger need for more beef, chicken etc... and to cater for these extra people the battery farms are needing to pump out more meat, and a lot faster too, hence the reason why they see fit to use hormones. Surely these hormones are beefing up the people eating the meat? I dont have any quotes to back me up, its just my thinking.... and not necessarily aimed at china, sort of a world wide epidemic creeping up. Just when I was in New Zealand we noticed that the younger generation eat a lot more KFC, and the girls seem to be 'developing' alot faster.