When people mention fatty liver, the first reaction must be that overweight people are prone to fatty liver, while for a person with a normal body mass index, if he is told that he has fatty liver, his first reaction must be “I am not fat, how can I have fatty liver?”. . What we people understand as “fatty liver” is related to fat, while the medical term is non-alcoholic fatty liver disease, a metabolic disease that can lead to cirrhosis and liver cancer in severe cases. It is true that this disease is more often seen in obese and overweight people, but, in fact, even in people of normal weight, there is a certain percentage of “fatty liver”. At the 66th annual meeting of the American Liver Association in the United States, researchers from the University of Hong Kong found that about one in five people of normal weight have a “fatty liver” and that this group may have more severe disease and a worse prognosis. In the study, a total of 911 subjects were included, of whom 701 had a BMI less than 25 and 210 had a BMI greater than 25, resulting in 19.3 percent of “fatty liver” in the non-obese population and 60.5 percent in the obese population. Increased waist circumference, insulin resistance, decreased HDL levels, increased triglyceride and ferritin levels are all high risk factors for developing “fatty liver” in non-obese people. Researchers believe that this group of people should not worry too much, if there is no other metabolic risk, through lifestyle modification can improve or even eliminate “fatty liver”.