Which finding is a sign of an eating disorder?

A sign of an eating disorder may present itself through the abrasion of knuckles. This often occurs in individuals who engage in practices such as self-induced vomiting, which can lead to the skin on their knuckles being scraped or damaged. When someone repeatedly makes contact with their teeth while attempting to induce vomiting, it can result in physical signs on the hands, specifically on the knuckles. This finding can serve as an indicator of potentially harmful behaviors associated with eating disorders like bulimia nervosa.

The other options, while they may indicate various health concerns, do not have a direct and specific association with eating disorders. Hypertension, for instance, could result from numerous other conditions unrelated to eating behaviors. Heavy menstruation may relate to hormonal imbalances or other gynecological issues, and increased physical activity is generally not a direct indicator of an eating disorder unless coupled with unhealthy behaviors like excessive exercise that leads to detrimental health effects. Therefore, the abrasion of knuckles stands out as a specific clinical finding often linked to disordered eating patterns.