What is the definition or description of: anorexia nervosa?

Symptoms of Anorexia: Anorexia nervosa is an eating disorder in which a person refuses to maintain a normal body weight, has a fear of being fat, and significantly misperceives their body weight or shape. People with anorexia tend to be female (about 90%). Patients are unaware that their preoccupation with weight is abnormal. They tend to see their low weight as an achievement, which limits their motivation to change.

Anorexia ?: Is eating disorder characterized by immoderate food restriction and irrational fear of gaining weight.

Anorexia: Is decrease sensation of appetite. Symptoms depend on cause of anorexia, for example anorexia nervosa which cause binging, purging, amenorrhea, fatigue, swollen joints, hair loss, etc. Etiology unknown in most cases of eating disorders, but genetics, environmental, psychological & medical factors can attribute.