Fatty liver is a clinicopathological syndrome in which the main body of the lesion is in the lobules of the liver and diffuse steatosis of the hepatocytes is the main cause. In a normal human liver, lipid content accounts for 2% to 4% of the wet weight of the liver, with phospholipids accounting for more than 50%, triglycerides (TG) for 20%, free fatty acids (FFA) for 20%, cholesterol for about 7%, and cholesteryl esters for the rest. When the lipid accumulation in hepatocytes exceeds 5% of the wet weight of the liver, or when there is histological steatosis of more than 1/3 of the hepatocytes per unit area, it is called fatty liver. Clinically, it is divided into two major categories, Alcoholic Fatty Liver Disease (AFLD) and Nonalcoholic Fatty LiverDisease (NAFLD), depending on whether there is excessive alcohol intake.