Fatty liver in 90 pounds girls is also possible, mainly due to the fact that fatty liver in addition to height and weight, its occurrence is also related to dietary structure, genetic factors, lipid metabolism disorders, etc., and the relationship with body weight is not absolute. 1. Dietary structure: some patients, because of long-term eating greasy food, lack of exercise or eating too much carbohydrates, etc., the remaining sugar will be converted into fat and accumulate in the liver, and the increase of fat is not necessarily manifested in body weight, but can also be manifested as an increase in visceral fat and fatty liver, etc. 2. Hereditary factors: if one of the parents suffers from hereditary hyperlipidemia, the child may have fatty liver after birth even if the weight is very light. 3. Metabolic disorders: Hypothyroidism is associated with the development of fatty liver, which is mostly unrelated to the patient’s weight. It is possible for a 90-pound girl to develop fatty liver, and it is recommended that she seek medical attention in time and intervene as soon as possible under the guidance of a professional physician to avoid progression of the disease.