Distorted body image? Nah.
Bulimics (sometimes) look in the mirror and are surprised how thin they look.
(Especially when they haven’t looked in a mirror for weeks. But that’s an anorexic tendency — to distort the body image to seem bigger than reality.)
In anorexia that might be used as an excuse to fast.
In bulimia that might equally be used as an excuse to eat.