Is fatty liver contagious in the end? To understand whether fatty liver is contagious we have to first review what is the cause of fatty liver formation. We all know that fatty liver is due to the accumulation of large amounts of fatty tissue in the liver cells caused by abnormal liver lipid metabolism. With the different degrees of fatty tissue accumulation fatty liver is divided into mild fatty liver, moderate fatty liver, and severe fatty liver, which eventually leads to abnormal transaminases and bilirubin indicators manifested as liver insufficiency. For the liver function insufficiency caused by mild fatty liver, it is true that the liver function index can be slowly restored to normal through low-fat diet, strengthening exercise, eating more fresh vegetables and fruits, and using “liver protection tablets” and “Shuijialin” liver protection drugs. This shows that mild fatty liver is not contagious. For moderate and severe fatty liver, although the indexes of liver function are not easy to return to normal within a short period of time, the indexes of liver function can also be adjusted to near normal through diet adjustment, drug control and appropriate exercise. Because liver function indicators are induced by fat accumulation, there is no problem of contagiousness. Many patients are worried about contagious infections because of abnormal liver function indicators, but it is necessary to clarify what the cause of liver function abnormalities is.