A joke to lighten things up, I hope.
Charles Jackson, the author of the semi-autobiographical book The Lost Weekend, defined an alcoholic as follows: An alcoholic is someone who can take a drink or leave it. So he takes it.
So how about the following definition of an anorexic: An anorexic is someone who can take food or leave it. So she leaves it.
When I was diagnosed with anorexia nervosa, humor helped me.