Researchers are finding that eating disorders are caused by a complex interaction of genetic, biological, psychological, and social factors. But many questions still need answers. Researchers are studying questions about behavior, genetics, and brain function to better understand risk factors, identify biological markers, and develop specific psychotherapies and medications that can target areas in the brain that control eating behavior. Brain imaging and genetic studies may provide clues for how each person may respond to specific treatments for these medical illnesses. Ongoing efforts also are aimed at developing and refining strategies for preventing and treating eating disorders among adolescents and adults.