Many of us have direct or indirect experience with eating disorders, and we’re most familiar with bulimia and anorexia, but more research is revealing additional disorders.

One, orthorexia nervosa, involves a rigid commitment to eating healthfully to the extent that the focus shifts to food quality and purity and a different kind of self-punishment.

Dr. Gayle Masterson is a psychiatrist at Sierra Tucson, a treatment and recovery center. Masterson spoke about the disorders.