Although the direct relationship between psychological health and physical health has long been recognized, there still is a great deal of misinformation and, to a degree, social stigma surrounding the subject of mental illness. This program looks at the epidemiology of mental disorders and promising treatment approaches that are emerging as researchers learn more about biology of such diseases. The diagnosis and treatment of depression--a leading illness throughout the world--and bulimia, a disease which affects teenagers and young adults, are probed in depth.