How about going to a place where the servings are smaller and more emphasis is on the food itself? We like things in bulk on this side of the pond whereas quality seems to hold more sway over in the mother country.
Even though the eating disorder is the extreme dangerous end if one could eventually get a person to restrict the calorie intake to less than an average American they would be far ahead of the game through their life. We eat like we are out working the fields as in the 1800s.
I know little on eating disorders so take this advice in context.
"All I want is a weeks pay for a day's work" Steve Martin