1, drinking alcohol: drinking alcohol is a common cause of fatty liver, drinking alcohol to fatty liver may be a direct toxic effect of alcohol on the metabolism of triglycerides in the liver. Healthy people, drinking alcohol containing 100-200 grams of ethanol per day for 10-12 days, regardless of whether their diet contains protein, fatty liver can occur, low protein is only an aggravating factor. 2, starvation: due to lower blood sugar, fatty acids in fatty liver tissues are mobilized into the blood, so that free fatty acids in the blood are elevated and there is moderate fat accumulation in the liver. Beijing Hospital of Traditional Chinese Medicine, Department of Liver Diseases, Qi Unity 3, malnutrition: due to the lack of protein, and lead to a decrease in the synthesis of very low density lipoprotein, which causes the liver to transfer triglycerides to become impaired, fat accumulation in the liver. 4, obesity: 50% of obese people have intrahepatic fat infiltration, which is due to the increase of adipose tissue and the increase of free fatty acid release. Fatty liver after hepatitis is due to excessive food intake, reduced exercise, coupled with liver function has not yet fully recovered, very easy to cause fat accumulation in the liver. Chronic hepatitis patients are also often accompanied by fatty liver due to inappropriate increase in nutrition and reduction in physical activity. 5, diabetes: about half of the diabetic patients with fatty liver, this is because diabetic patients, glucose can not be used, resulting in the three major metabolic disorders, and eventually fatty acid accumulation in the liver caused by fatty liver. 6, corticosteroids: long-term use of hormones can make people obese and fatty liver. 7, tetracycline: can cause fatty liver, especially in pregnant women, often cause fatty liver similar to the performance of acute fatty liver in pregnancy, the mortality rate of up to 75% or more. 8, other: pregnancy can cause fatty liver in pregnancy, congenital dementia syndrome, galactosemia, familial hyperlipidemia, non-β-lipoproteinemia, clonorchiasis and ulcerative colitis, etc. can cause fatty liver.