Final answer:
Anorexia nervosa is an eating disorder characterized by maintaining body weight well below average through starvation and excessive exercise. This disorder can have significant negative health outcomes and can also lead to psychological problems.
Step-by-step explanation:
Anorexia nervosa is an eating disorder characterized by the maintenance of a body weight well below average through starvation and/or excessive exercise. Individuals with anorexia nervosa often have a distorted body image, referenced in literature as a type of body dysmorphia, meaning that they view themselves as overweight even though they are not. This disorder can cause significant negative health outcomes, including bone loss, heart failure, kidney failure, amenorrhea, and reduced function of the gonads. Additionally, it can lead to psychological problems such as anxiety disorders, mood disorders, and substance abuse.