Sry to tell u this, but this animation is just totally wrong. U believe this girls think of "fat" the way u do, but they dont. They do not need to look like a balloon to feel fat, they only need to weight a little bit more, to do so.
U dont want them to be so skinny? Thats ok and really good, but u can't just say, that ur oppinion is the oppinion of all. If the girls do not want to weight even 100g more, than the piece of cake is already to much.