"200 Pounds Beauty" Korean Movie - Girl loses weight to become famous, even shows her keeping the weight off by exercise and diet. KDrama "Dream High" has similar plot but the girl returns to being fat :/ she is also relatively not famous. As for anime, there is "Kiss him, not me" where in a fat fujoshi loses weight due to her favorite character being killed off of a show or something, haven't finished it yet. "The Last Empress" isn't worth watching but has a guy lose weight and becomes unrecognizable to his own sister making a disguise unnecessary lol fat jokes galore, wish the rest of the story was better.