Fatty liver is a lesion caused by excessive accumulation of fat in liver cells due to various reasons. Fatty liver disease is seriously threatening the health of the nation, becoming the second most common liver disease after viral hepatitis, and has been recognized as a common cause of insidious cirrhosis. It has been shown that fatty liver can shorten the life expectancy of people under 50 years old by 4 years and that of people over 50 years old by 10 years. The prevalence of fatty liver in Shanghai is increasing year by year and is getting younger. Nowadays, almost 1 out of 3 people have fatty liver, which is comparable to that in Europe and America. Definition: Fatty liver refers to excessive accumulation of fat in liver cells due to various reasons, and the fat content is more than 5% of liver weight. Causes: Risk factors for fatty liver include irrational dietary structure, obesity, alcoholism, and a lifestyle of sitting too much and moving too little. This disease used to occur mainly in the rich western countries, but now Chinese people are also facing the great threat of this “rich man’s disease”. Particular attention should be paid to the fact that the incidence of fatty liver in obese children in China is as high as about 80%. 1.Drinking alcohol. Long-term excessive alcohol consumption and protein deficiency, or lack of riboflavin, pantothenic acid, niacin in the food, will cause liver function damage, damaged liver fatty acid metabolism obstacles, leading to excessive accumulation of fat in the liver. 75%-90% of chronic alcoholics have fatty liver, and 20%-30% of the alcoholic fatty liver will eventually develop into cirrhosis, or even liver cancer. Excessive nutrition. Eating big fish and meat, fried food and sweet food for a long time will make the liver synthesize too much fat. It increases the burden on the liver, interferes with the metabolism of fat, and breaks the input-output balance of the liver, and the fat will accumulate in the liver, forming fatty liver. 3.Obesity. About half of the obese people have the tendency of fatty liver, the main reason is that the blood of obese people contains a lot of free fatty acids, which are constantly transported to the liver, greatly exceeding the metabolism of the liver, causing the accumulation of fat in the liver and resulting in obese fatty liver. 4, diabetes. About half of the patients with type 2 diabetes mellitus are accompanied by fatty liver, which is because the glucose and fatty acid in diabetic patients can not be well utilized, and the synthesis of lipoprotein is also impaired, and most of the glucose and fatty acid are converted into fat in liver, which ultimately makes the fat pile up in the liver and triggers fatty liver. Post-hepatitis fatty liver is due to excessive food intake, reduced exercise, coupled with liver function has not been fully recovered, it is very easy to cause fat accumulation in the liver.