They are very judgemental, that being said SK is a country with a growing wasteline. Although Asian food (authentic not takeaway) is considered quite healthy, Korean food is probably one of the more greasy of the Asian cusines, that and increasing amount of Western food in their diet.  A lot of parents will put a lot of pressure on their kids to stay thin, also on CVs you have to show a picture of your face.  Source: GF is Korean