So the current obsession of the middle child is definitely boobs. So I used it to my advantage.
She was walking around all day yesterday discussing how fat she is. This child is like a bony toothpick, seriously.
So after I'd had enough of the fat talk, I said, "Look, if you were fat, you'd have boobs. You don't have boobs, so you're not fat. Got it?"
She says, "OH! I guess I'm not fat then!"