I. What is fatty liver? Fatty liver is a lesion caused by excessive accumulation of fat in liver cells due to various reasons. Usually, what we call fatty liver is known as “fatty liver disease”, which is clinically classified into “alcoholic fatty liver disease” and “non-alcoholic fatty liver disease” according to the history of excessive alcohol consumption. “There are two types of fatty liver disease. Fatty liver can be caused when there is an excessive source of fat, with increased synthesis and decreased utilization and release. Fatty liver can be classified as mild (containing 5% to 10% fat), moderate (containing 11% to 25% fat), and severe (containing 25% or more fat) according to the ratio of lipid content in the liver to the wet weight of the liver. Fatty liver is not an independent disease and many causes can contribute to fatty liver. Common causes include heavy alcohol consumption, obesity, diabetes, hepatitis, etc. Other causes such as malnutrition, endocrine disorders, and certain medications (e.g. diet tea) can also cause fatty liver. However, the most common cause is fatty liver caused by disorders of lipid metabolism caused by overnutrition. Therefore, some people also call it the disease of modern civilization. Fatty liver is closely related to the occurrence of cirrhosis of the liver, diabetes, cardiovascular disease, etc. Second, what are the dangers of fatty liver? Non-alcoholic fatty liver has become the number one chronic liver disease in developed countries in Europe and America and affluent regions in China, and the population with non-alcoholic fatty liver is second only to hepatitis B patients in China. Fatty liver is not a disease with a benign prognosis, as much as it may cause adverse consequences such as cirrhosis or even liver cancer. Fatty liver disease is divided into 3 different stages according to its development: simple fatty liver, steatohepatitis, and fatty liver-related cirrhosis and hepatocellular carcinoma. At the same time, fatty liver is often associated with the development of obesity, hyperlipidemia, diabetes and hypertension. 1.Harm to liver: can develop into steatohepatitis → cirrhosis → liver cancer. 2.Harm to cardiovascular: combined with abnormal fat metabolism, can promote the formation of atherosclerosis, can also induce and aggravate hypertension, coronary heart disease. 3, induce or aggravate diabetes, affect human digestive and absorption functions, induce gallbladder disease, reduce the quality of life, affect work, detrimental to career development.