Restrictive eating disorders with pronounced starvation are serious psychiatric conditions that often begin during childhood or adolescence. An early and efficient intervention is crucial to minimize the risk of the illness becoming longstanding and to limit the consequences. There is good evidence that weight gain during the first month of treatment provides a better prognosis. Only a limited amount of young people suffering from severe restrictive eating disorder receive an evidence-based treatment at present in Sweden. The ROCKETLAUNCH project intends to implement key components of the evidence-based family therapy during the first month of treatment in child and adolescent psychiatric outpatient care.