Anorexia Nervosa
Core concept
Persistent restriction of energy intake leading to significantly low body weight, intense fear of weight gain or persistent behavior interfering with weight gain, and disturbance in self-perceived weight/shape.
Plain-language explanation
Anorexia Nervosa involves three interconnected features: restrictive eating that produces a significantly low body weight for the person's age, sex, and developmental trajectory; an intense fear of gaining weight (or behavior that persistently prevents weight gain even while underweight); and a disturbance in how body weight or shape is experienced or its importance for self-evaluation.
Recognition pattern
Restriction of energy intake relative to requirements leading to a significantly low body weight in context of age/sex/developmental trajectory/physical health, plus either intense fear of gaining weight/becoming fat or persistent behavior interfering with weight gain, plus disturbed body-weight/shape self-perception or persistent lack of recognition of the seriousness of the low body weight.
Developmental considerations
Onset commonly occurs in adolescence, though presentations across childhood and adulthood also occur; the condition carries significant medical risk and among the highest mortality rates of any mental health condition, making early recognition especially important.
Functional impact
Medical complications (cardiovascular, endocrine, bone density) and significant psychosocial impairment (withdrawal from social eating situations, preoccupation with food/body) are common; functioning can appear superficially preserved in some domains (e.g., academic achievement) even as physical health deteriorates.
Associated features
Preoccupation with food, calories, and body checking behaviors; social withdrawal, particularly around eating situations; and, in some individuals, co-occurring perfectionism or rigid thinking patterns are frequently observed.
Differential considerations
Low weight due to a medical condition, another mental health condition affecting appetite (such as a depressive episode), or Avoidant/Restrictive Food Intake Disorder (restriction without the characteristic fear of weight gain or body-image disturbance) must be considered before concluding Anorexia Nervosa.
Cultural considerations
Body ideals, the social meaning of thinness, and food-related practices vary substantially across cultures, and presentations may differ in whether an explicit "fear of fatness" is verbally expressed versus other culturally shaped justifications for restriction being given.
Common misconception
A common misconception is that Anorexia Nervosa only affects a particular demographic (for example, only affluent young women) or that it is a "choice" or diet taken too far. It occurs across genders, ages, and backgrounds, and involves serious physiological and psychological processes, not simple willpower around eating.
Reconsider this formulation
If significant weight loss is clearly explained by a diagnosed medical condition, and the person expresses no fear of weight gain or body-image disturbance and is actively distressed by the weight loss itself, an educational case would prompt you to consider a medical cause rather than Anorexia Nervosa.
Example fictional case
Over several months, a student has significantly restricted food intake and lost a substantial amount of weight, insists they still need to lose more despite being underweight by clinical standards, avoids eating with friends, and becomes visibly anxious when discussing food or weight.
Quick recall
Know
Anorexia Nervosa requires restriction leading to significantly low body weight, plus fear of weight gain (or weight-gain-preventing behavior), plus disturbed body-weight/shape self-perception.
Notice
In a case, notice restrictive eating producing clinically low body weight combined with either explicit fear of weight gain or persistent behaviors preventing it, and some disturbance in how weight/shape is perceived.
Distinguish
Distinguish Anorexia Nervosa from Avoidant/Restrictive Food Intake Disorder by the presence of weight/shape-driven fear and body-image disturbance (present in Anorexia Nervosa, absent in ARFID).
Commonly confused conditions
Practice questions
2 question(s) reference this disorder. Practice Anorexia Nervosa →