For years, eating disorders such as bulimia and the binge / purge subtype of anorexia were thought to be connected to cultural and psychological pressures, especially among girls and women. But a new study by a Michigan State University psychologist indicates binge eating may have biological roots. Dr. Kelly Klump concludes that female rats are more likely to binge eat than males. Her work could influence the science of eating disorders in humans. She spoke with Current State host Mark Bashore.