A client suspected of having anorexia nervosa is placed on bed rest with an IV infusion and a high- carbohydrate liquid diet. Within 72 hours, the results of her lab work show a return to normal limits. She is transferred to the psychiatric service for further treatment. A behavior modification plan is initiated. Three days after her transfer, the client tells the nurse, I haven't exercised in 6 days. I won't be eating lunch today."This statement by her most likely reflects:"