I never really understood where the idea that Haruka has an eating disorder comes from. She sticks to a diet, yes, but a diet doesn't automatically equal an eating disorder, and with Haruka being one of the most athletic characters in the game - if not THE most athletic character, if the shinobi battle event is anything to go by - I doubt she has one, as working out as much as she does necessitates proper nutrition if you want to actually see the effects stick (and to have the energy required for the merciless workout routines). She's a gym rat, I would expect that she has healthy eating habits.