Let's be honest here, Korean food's not that exciting - it can be good, sure, but there's not a lot of variety. Plus, if you eat too much of their chilli and vinegar dominated kimchi, you wind up with stomach cancer. ("It is the leading cancer type in Korea, with 20.8% of malignant neoplasms.") That probably contributes to less fat people. Also, they're more image-centric than Hollywood! (I used to work above a Korean plastic surgery in Hollywood, it was a veritable production line)