Do you mean how can you get to the root of an eating disorder? If so, I would recommend seeking out the assistance of a mental health therapist who specializes in the treatment of eating disorders. This professional can help the person understand the origins of the issue and how to overcome it. Often mental health issues like eating disorders result from a combination of environmental triggers and genetic predispositions. Since eating disorders like anorexia can be fatal if left untreated, it is very important to reach out for help as soon as possible.