I think the answer you got is correct: this is what a lot of people who are semi-recovered from an eating disorder wind up with. That aspect is what distinguish

I think the answer you got is correct: this is what a lot of people who are semi-recovered from an eating disorder wind up with. That aspect is what distinguishes it from other obsessions. Interestingly, eating disorders and chronic semi-starvation lead to rigid, OCD-like behaviors. For me it was rituals around walking and movement - they have faded away during eating disorder recovery.