Anorexia Nervosa is a psychological and potentially life-threatening eating disorder. Those suffering from this eating disorder are typically suffering from an extremely low body weight relative to their height and body type.
Avoidant/Restrictive Food Intake Disorder (ARFID) ARFID was introduced as a new diagnostic category in the recently published DSM-V. The ARFID diagnosis describes individuals whose symptoms do not match the criteria for traditional eating disorder diagnoses, but who, nonetheless, experience clinically significant struggles with eating and food. Symptoms of ARFID typically show up in infancy or childhood, but they may also present or persist into adulthood.
Rumination disorder is an eating disorder in which a person -- usually an infant or young child -- brings back up and re-chews partially digested food that has already been swallowed. In most cases, the re-chewed food is then swallowed again; but occasionally, the child will spit it out.