Which type of anorexia nervosa involves not eating at all?

The restrictive type of anorexia nervosa is characterized by a significant reduction in food intake, often leading to severe caloric restriction and an Intense fear of gaining weight. Individuals with this subtype typically engage in limiting the amount and types of food they consume and may also engage in excessive exercise to control their weight. Consequently, this can lead to extremely low body weight and malnutrition.

In contrast, the other types of anorexia nervosa do not solely focus on the complete absence of eating. The binge-eating type involves episodes of consuming large quantities of food followed by inappropriate compensatory behaviors. The purge type includes behaviors such as vomiting or the use of laxatives to prevent weight gain after eating. The term "compulsive type" is not recognized as a specific subtype within the clinical definitions of anorexia nervosa.

Therefore, the restrictive type is correctly identified as the type that involves not eating at all, reflecting a primary behavior of severe dietary restriction rather than episodes of eating followed by compensatory actions.