This question needs a careful answer, because eating disorders are not habits to be managed lightly. Anorexia nervosa, bulimia nervosa, and binge-eating disorder are serious psychiatric illnesses, and they can be life-threatening. Anorexia carries the highest mortality rate of any psychiatric condition. These illnesses affect the body as well as the mind, disturbing heart rhythm, electrolytes, and organ function, which is why any honest discussion has to begin with the seriousness rather than with technique.
The established care reflects that seriousness, and hypnosis is not part of its core. For bulimia and binge-eating disorder in adults, the first-line treatment is a specialized form of cognitive behavioral therapy, often called CBT-E. For adolescents with anorexia, family-based treatment is the favored approach. Across all of these, medical monitoring runs alongside the psychological work, because the physical risks have to be tracked and treated. This is specialist territory, delivered by clinicians trained in eating disorders, and it is what carries someone toward recovery.
Hypnosis, set honestly against that, is not a treatment for an eating disorder. At most it might serve as a cautious adjunct within specialist care, and only with professional oversight. Where it appears, it is in a supporting role: helping someone manage the anxiety that surrounds eating, or the distress that fuels a binge, while the actual treatment does the central work. It does not correct the distorted thinking, restore nutritional health, or address the medical danger. Used on its own, or used to delay real treatment, it is not just ineffective; it can be harmful.
The central point is also the simplest. Anyone living with an eating disorder, or worried about someone who is, should reach out to a doctor or an eating-disorder specialist. Early treatment improves outcomes, and these illnesses rarely resolve on their own. National eating-disorder helplines and primary-care physicians are appropriate first contacts.
So the realistic answer to the question is narrow and bounded. Hypnosis may, in some cases and under supervision, ease parts of the emotional weight that surrounds the illness. The illness itself belongs in the hands of specialist medical and psychological care, never in place of it.