What is the symbol for ANOREXIA?

NO, I am not & have not been anorexic, but I'm doing a project on the book "Just Listen" by Sarah Dessen, in which one of the characters is anorexic, and I have to symbolize that somehow. I know the color is periwinkle, but what is the symbol for it, if there is one? I've heard a periwinkle dragonfly, but I'm not for sure. Thanks(: