Eating disorders, in particular anorexia nervosa (AN) and obsessive-compulsive disorder (OCD) are often debilitating brain-based disorders that place significant burdens on patients, families and the larger economy. Although we know that both disorders run in families due to genetic factors, we do not have a good way to measure an individual’s genetic risk for these illnesses. This study will provide new measures of shared and unique AN and OCD genetic risk and will examine how these genetic risk scores predict problems with emotional, behavioral and cognitive functioning and eating disorders symptoms in order to better prevent, detect, and treat these disorders.