Multiple Personality Disorder is managed by hypnotic suggestion and "talk-therapy" that's used for a long time. It's managed by having regular visits for therapy and psychotherapy. There are no diets or excercises that could be useful to manage Multiple Personality Disorder.
MPD individuals may have other personalities who may have certain diets, but there is no specific diet for an MPD individual to get well. There are a lot of medications, though.
