The liver is located in the right upper abdomen of the body and occupies a portion of the epigastrium, with a small portion in the left upper abdomen. It is below the lungs and diaphragm. Usually, it is covered by the right rib cage and rib arch and the lower edge of the liver cannot be palpated in the upper abdomen. However, in a small percentage of cases, the lower edge of the liver can be palpated below the rib cage, but usually not more than 1-2 cm. The liver is divided into two lobes, the right and left, and is held in the abdominal cavity by many ligaments, and the surface is wrapped by a grayish-white hepatic envelope. The liver is rich in blood flow and has two vessels responsible for blood supply: 1/4 from the hepatic artery and 3/4 from the portal vein. The hepatic artery is the arterial blood from the heart and supplies mainly oxygen, while the portal vein collects venous blood from the digestive tract and supplies mainly nutrients. The liver is the largest gland in the human body, it plays a very important role in human metabolism, bile production, detoxification, blood clotting, immunity, heat production and regulation of water and electrolytes, and is a huge “chemical factory” in the human body. 1, metabolic functions: sugar, fat, vitamins A, B, C, D, K and hormone metabolism are completed by the liver; 2, bile production and excretion: the uptake of bilirubin p combination and excretion, the production and excretion of bile acids are undertaken by the liver. Hepatocyte production p secretion of bile, transported to the gallbladder via the bile duct, the gallbladder concentrated and discharged into the small intestine to help the digestion and absorption of fat. 3, detoxification role: the human metabolic process produced by some harmful waste and foreign toxins p toxins, drug metabolism and decomposition products, are detoxified in the liver. 4, immune function: the liver is the largest reticuloendothelial cell phagocytosis system, it can isolate and eliminate invasive and endogenous various antigens through phagocytosis p 5, synthetic function: almost all of the coagulation factors and some important proteins are manufactured by the liver. 6.Other: The liver is involved in the regulation of the body’s blood volume p heat production and the regulation of water and electrolytes. Such as liver damage to sodium p potassium p iron p phosphorus p and other electrolyte regulation imbalance, common is water sodium retention in the body, causing edema, ascites, etc.. The liver is one of the most important organs in the human body, but at the same time, it is a very fragile organ. So, how to protect your liver? First, insist on exercising every day: exercise can promote gas exchange and blood circulation, speed up metabolism, which is conducive to the unblocking of liver qi. Keep a good mood: as the saying goes, “anger hurts the liver”, any anger, depression are important factors that damage the liver. Anger and anger can easily lead to stagnation of liver qi, which is prone to liver disease in the long run. Therefore, the elderly should learn to self-regulate and try to be calm, optimistic and cheerful. Do not drink too much alcohol: the liver’s ability to metabolize alcohol is limited, if it exceeds a certain amount, it will be harmful to the liver. Second, the diet should be balanced: overeating or frequent starvation can affect the normal function of the liver. Eating a high-fat diet often may cause fatty liver. Therefore, three meals a day should be balanced in the right amount, not partial food. Third, drink more fresh plain water: health care experts recommend that drinking water should be the same as eating, regular and quantitative, 3 or 4 times a day, a large bowl each time. Daily rationing of water can increase the amount of circulating blood, enhance the vitality of liver cells and facilitate the elimination of metabolites. Fourth, minimize exposure to harmful substances: the liver is the body’s largest detoxification organ, a variety of toxic substances can also harm liver cells. Such as lead, mercury, arsenic, benzene, aflatoxin and certain drugs (such as sedatives, etc.), can cause liver cell necrosis to varying degrees. Therefore, you should avoid contact with toxic substances in your daily life as much as possible, and be cautious in using or not using drugs that may damage the liver. Fifth, try to avoid blood transfusion and use of blood products to prevent transfusion hepatitis; use disposable syringes and needles. Sixth, pay attention to hand washing in public places as well as before and after meals to prevent contact transmission of liver disease. Seventh, people with a family history of susceptible liver disease should pay particular attention to regular medical checkups and seek medical attention if they feel unwell.