In the '60s and '70s, America's music scene was marked by raucous excess, reflected in the tragic overdoses of young superstars such as Jimi Hendrix and Janis Joplin. At the same time, the uplifting harmonies and sunny lyrics that propelled Karen Carpenter and her brother, Richard, to international fame belied a different sort of tragedy--the underconsumption that led to Karen's death at age thirty-two from the effects of an eating disorder. In Why...