As an Asian I don't think it is fat shaming but it has everything to do with culture. Excessive of anything is not tolerated other than education. It goes like, "oh, you must have all this money to waste on becoming fat but you can't help the neighbors who are starving." Plus, you don't want to bring shame on to your family and family plays a huge part on how your behave and interact socially. Also, the teachers, they will beat the fat out of you with a bamboo stick. Good days, thank god beating is allowed to correct behaviors in school.