I keep hearing people say "food is medicine is only an issue with anorexia." This isn't true. Normalizing nutrition and eating are fundamental elements of treatment for ALL eating disorders.
Yes, with anorexia there is usually a need to regain weight lost or catch up on growth delayed. This isn't a matter of just getting "out of danger" and out of the hospital. This is about getting up to the weight, body composition, and balanced of nourishment that person needs for OPTIMAL health - based on that individual's unique normal body dimensions.
The purge cycle, in bulimia and with purging anorexia, involves erratic nourishment and mealtimes.
Binge eating disorder involves intermittent fasting and binging - and unbalanced nourishment.
"Food is medicine" means more than just feed 'em up and gain some weight. It means that the full range of nutrients: fats, proteins, fiber, vitamins, micronutrients, fluids, etc. are being taken in at regular intervals in a calm and safe environment. It means desensitization to feared foods, and "exposure and response prevention" by way of normalized eating. Normalized eating helps to treat the mental symptoms: mood, cognition, attention, obsessions, compulsions.
Food is medicine isn't ALL the treatment needed, but it isn't optional -- and it isn't just about anorexia or about weight loss.