Brandon suffers from bulimia nervosa and has finally sought the help of a therapist. His psychologist, who ascribes to the cognitive-behavioral model, gives Brandon instructions to eat specific types and amounts of food but to resist (at all costs) the urge to make himself vomit. The hope is that Brandon will come to see that eating can be a healthy and constructive behavior that requires no undoing. Brandon's psychologist is using a technique called: