Final answer:
Bobby is most likely experiencing anorexia nervosa, an eating disorder characterized by extreme fear of gaining weight and an unrealistic perception of one's own body weight. Professional help and support are necessary to address this condition.
Step-by-step explanation:
Bobby is most likely experiencing anorexia nervosa, which is an eating disorder characterized by extreme fear of gaining weight and an unrealistic perception of one's own body weight. Individuals with anorexia nervosa often have a distorted body image and see themselves as overweight even when they are very thin.
Anorexia nervosa can cause severe health problems and even death if left untreated. It is important for Bobby to seek professional help and support for his condition.