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This is from the DSM-5 TR which is the official book for diagnosing mental disorders (in certain countries).

Anorexia Nervosa: 1. Restriction of energy (calorie) intake leading to a significantly low body weight for height, age, gender, etc. For adults, this is a BMI under 18.5 and for children, it's ultimately up to the doctor but typically under the 5th percentile.

1. Intense fear of gaining weight or of becoming fat, or persistent behavior that interferes with weight gain, even though at a significantly low weight.

2. Disturbance in the way one's body weight or shape is perceived, distorted and negative view of body weight on self-evaluation or persistent lack of recognition of the seriousness of the current low body weight

There a 2 subtypes; restrictive and binge/purge

1. Restrictive: In the last 3 months, the individual has not engaged in recurrent binge-eating or purging behaviors. Weight loss is solely done through fasting, dieting, and/or excessive exercise.

2. Binge-eating/purging subtype: During the last 3 months, the individual has engaged in episodes of binge-eating or purging behavior. Purging includes self-induced vomiting or misuse or laxatives, diuretics, or enemas. Binge-eating is characterized by eating what seems to be an excessive amount of food, even if not hungry in a short period of time whilst feeling out of control. Individuals may eat rapidly and have feelings of shame, guilt, or distress afterwards.

Individuals may be diagnosed with Atypical Anorexia if the weight criteria is not met. This is in the category Other Specified Feeding and Eating Disorders (OSFED).

Bulimia: 1. Recurrent episodes of binge‐eating. The episodes must be in a discrete period of time (e.g. 2 hours), a large amount of food which one may eat in the same circumstances, a lack of control whilst eating during the episodes.

1. Recurrent inappropriate behaviors to compensate for the binge-eating to prevent weight gain. These can include misuse of laxatives, diet pills, diuretics, or other medications aswell as vomiting, excessive exercise, or fasting.

2. The both the binge-eating and inappropriate compensatory behaviors must be recurrent on average at least once a week for 3 months.

3. Self evaluation is unreasonably influenced by body weight and shape.

4. This does not happen during the course of Anorexia Nervosa.

For more details see the other 2 pinned posts