Which of the following disorders is characterized by eating nonnutritive substances?

The disorder characterized by the consumption of nonnutritive substances is Pica. Individuals with Pica engage in eating behaviors that involve ingesting items that are not considered food, such as dirt, clay, chalk, or other non-food items. This behavior can occur in various contexts, including during pregnancy or in individuals with developmental conditions. The diagnosis of Pica requires that the behavior persists for at least one month and is inappropriate to the developmental level of the individual, not part of a culturally supported practice, and not better explained by another mental disorder.

In contrast, Avoidant/Restrictive Food Intake Disorder involves a limited range of foods due to avoidance of certain textures or colors, Rumination Disorder is characterized by the regurgitation of food and subsequent re-chewing or re-swallowing, and Anorexia Nervosa involves an intense fear of gaining weight and a significant restriction of food intake. None of these conditions include the eating of nonnutritive substances, making Pica the correct choice in this context.