Weirdly enough, I recently read a psych book about different disorders and how they are perceived around the world.
Before anorexia became widely known throughout the world, there was a form of anorexia in Hong Kong, where women because of emotional distress began to strongly dislike food/eating, and had no appetite. They had no concept of "distorted body image" nor did they want to lose weight. They just didn't want to eat. Its still an eating disorder, its just not the DSM definition of anorexia, and therefore not labelled. (Or at least it didn't have a label, I don't know about recently)