Overeating disorder is a psychiatric (psychological) disorder that is classified as a feeding and eating disorder in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), the latest U.S. diagnostic criteria are as follows: A. Consistent consumption of non-nutritive, non-edible substances for at least one month. B. The eating of non-nutritive, non-edible substances is not commensurate with the individual’s developmental level. C. The eating behavior is not culturally supported or is not part of normal social practice. D. If the eating behavior occurs in the context of another psychiatric disorder (e.g., intellectual disability), autism spectrum disorder, schizophrenia, or somatic illness (including pregnancy), it needs to be severe enough to require additional clinical attention to make a diagnosis of omnivorous eating disorder. Diagnostic considerations: 1. The essential feature is persistent eating of one or more non-nutritive, non-edible substances for at least one month that is severe enough to require clinical attention. 2.Orthorexia commonly involves a preference for eating the following substances, including paper, soap, cloth, hair, wool, string, clay or ash, chalk, talcum powder, especially, chewing gum, stones, charcoal or coal, starch, ice, etc. 3.Eating diet products cannot be considered as heterophagia. 4.This behavior is not proportional to the patient’s developmental level. The normal eating behavior of infants and children exploring the outside world before the age of 2 cannot be diagnosed as omnivorous disorder. 5. The eating of non-nutritive, non-edible substances is allowed in the culture of the ethnic group or group and cannot be diagnosed as omnivory. The etiology is unknown, but clinical findings suggest that patients are often found in families with poor family relationships, lack of supervision, neglect, and abuse during childhood. Development and course Overeating disorder can begin in childhood, adolescence, or adulthood. Overeating disorder in adulthood is often co-morbid with mental retardation. Complications often result in infection, poisoning, malnutrition, and intestinal obstruction, which often requires surgical treatment. Differential diagnosis Overeating disorder can exist alone or in combination with other psychiatric disorders (e.g., mental retardation), autism spectrum disorders, schizophrenia, or somatic disorders. Other psychiatric (psychological) disorders such as anorexia nervosa, do-gooder disorder, and non-suicidal self-harm need to be excluded. Treatment: 1. Psycho-behavioral treatment. 2, Combined emotional problems may require medication. 3. Complications, such as infection, poisoning, malnutrition, intestinal obstruction, require appropriate clinical treatment.