After assessing a client with anorexia nervosa, which sign is most concerning?

Low body temperature is particularly concerning in a client with anorexia nervosa because it can indicate severe malnutrition and potentially life-threatening hypothermia. Anorexia nervosa is characterized by extreme weight loss and a distorted body image, which can lead to physiological changes, including a drop in body temperature. This symptom reflects the body's inadequate nutritional intake and can signify that the client's overall health is critically compromised.

Monitoring vital signs, including temperature, is essential in assessing the severity of an eating disorder. A low body temperature may necessitate immediate medical intervention, as it could signal the need for refeeding and stabilization of the patient's condition to prevent further complications.

While brittle hair and weight loss are relevant concerns, they often indicate chronic malnutrition and do not pose an immediate threat to health like hypothermia. Electrical activity in the brain is less directly associated with immediate physical symptoms of anorexia nervosa and would typically be assessed with specific neurological concerns rather than as a sign of the condition itself.