A lot of asian girls are "skinnyfat" because they dislike exercise so they rely on diet to stay thin. I think this is part of the reason why the BMI cut off f  3e18  or obesity is recommended to be much lower for asian women than women of other ethnicities. I think this is also why asians have the concept of "fat for an asian" when we talk about women who look chubby but are still within the range of a US normal size BMI. E.g. My sib is 5'3" and about 120-130 lbs but she's fat and could lose some weight by asian standards.