Alanine aminotransferase is mainly used to diagnose and identify hepatobiliary diseases, etc. Slightly below normal values are usually not clinically significant and do not require treatment. Serum alanine aminotransferase, also known as glutamine aminotransferase, is found mainly in liver cells. Its normal value is 0~40U/L, and below 40U/L belongs to the normal range. Low serum alanine aminotransferase values fluctuate in relation to liver cell damage, with the more severe the liver cell damage, the higher the value. Lower alanine aminotransferase indicates that no cell destruction or necrosis has occurred, so the serum level will be lower. Therefore, you should continue to maintain the current state of health, pay attention to the appropriate daily supplementation of some high-quality protein, such as lean meat, eggs, etc., light diet, adjust the work and rest, moderate exercise. If the alanine aminotransferase is lower than normal, it is recommended to go to the hospital and ask the physician in time.