What is orthorexia?

About 20 million women and 10 million men in the United States suffer from an eating disorder. Anorexia nervosa is the most well-known because it usually results in drastic weight loss. But a whole range of eating disorders are harder to diagnose. Dr. Joanna Steinglass does research and treatment at Columbia Psychiatry. She says there are two shared features in every type of eating disorder: weight has taken too much of a role in the person's everyday life and eating habits change rapidly.