Anorexia nervosa is a disorder dealing with extreme obsession with diet and weight loss. Many who have anorexia have a distorted sense of body image. They tend to starve and excessively exercise. It is closely related to perfectionism and depression. Often, there are obsessive food habits; they are secretive and can have antisocial behaviors. If the condition becomes extreme, hospitalization with forced feeding may be recommended, which can cause legal and ethical concerns.

Bulimia nervosa is an eating disorder where people binge eat and purge, which is usually done by self-induced vomiting. However, laxatives, diuretics, fasting, or obsessive exercising could be involved as well. It commonly begins during adolescence and is difficult to identify because individuals who have bulimia tend to be secretive about their eating habits. Often, those who suffer from bulimia nervosa tend to suffer from anxiety, depression, and low self-esteem. Many who have bulimia are overweight and have a fear of gaining more weight.

Binge eating disorder is associated with extreme overeating, and people who binge eat tend to be overweight or obese. Often, people who binge eat will eat alone because they are ashamed and or embarrassed when they eat. This behavior must occur two days a week for six months to be considered a disorder

ARFID, or Avoidant Restrictive Food Intake Disorder, is when people avoid or restrict food. Often, people with this disorder are trying to prevent negative experiences from the past and are not interested in food. They may have sensory issues, and texture and smell could bother them.

Pica refers to eating nonfood items like soap, hair, or paper.

Rumination refers to repeatedly regurgitating food after eating, and additionally, previously swallowed food into the mouth typically to be rechewed and spit out.