Problem:
To diagnose this disorder, the following three criteria from the Diagnostic and Statistical Manual of Mental Disorders - the 5th version (DSM-5) must be met. Which disorder is it?
1. Persistent restriction of energy intake leading to significantly low body weight (in context of what is minimally expected for age, sex, developmental trajectory, and physical health).
2. Either an intense fear of gaining weight or of becoming fat, or persistent behaviour that interferes with weight gain (even though significantly low weight).
3. Disturbance in the way one's body weight or shape is experienced, undue influence of body shape and weight on self-evaluation, or persistent lack of recognition of the seriousness of the current low body weight.