Background: Obsessive-compulsive disorder (OCD) is characterized by pervasive ideas and compensatory behaviors—obsessions and compulsions—that are used to reduce the stress caused by the intrusive thoughts. OCD frequently first manifests in adolescence and is both underreported and undertreated. Early intervention is essential since it can result in serious debilitation. It is known that there are common points between ED and OCD in terms of etiological, biological, clinical, and therapeutic approach. Clinically, the fears about weight gain, repetitive and persistent preoccupation with food, body image, and losing weight pathways as well as eating vast amounts of food with an irresistible desire and making an effort to vomit afterwards, over-exercising, and ritualized eating attitudes of patients with anorexia and bulimia are likened to unblocked thoughts and repetitive/ritualistic behaviors as those of patients with OCD. In addition to clinical similarities between OCD and ED, there are some similar biological characteristics in the serotonergic system. Research has demonstrated that more than 40 percent of people with an eating disorder may also experience symptoms of OCD and as many as 17 percent of people who have OCD may also have an eating disorder.