Orthorexia is an unhealthy fixation on eating only healthy or "pure" foods. Those who have an unhealthy obsession with otherwise healthy eating may be suffering from orthorexia, which literally means “fixation on righteous eating.” Orthorexia is a serious eating disorder. It often starts out as an innocent attempt to eat more healthfully, but orthorexics become fixated on food quality and purity.They become consumed with what and how much to eat, and how to deal with “slip-ups.” Self-esteem becomes wrapped up in the purity of one’s diet. Marjorie Nolan Cohn, MS, shares more about this disease and how to know if your or someone you know struggles with an unhealthy obsession to eat healthfully.