Elevated alanine aminotransferase is common in liver diseases such as staying up late and straining, fatty liver, alcoholic liver, viral hepatitis and autoimmune diseases, blood diseases, malignant tumors, etc. It should be treated actively for the original disease before it can be restored to normal. The time of decline is related to the disease, treatment measures, the patient’s physical condition and other factors, and varies greatly among individuals. Elevated alanine aminotransferase suggests abnormal liver function and possible inflammation of the liver. If it is mildly elevated, it can generally come down on its own within 1 week by adjusting the daily lifestyle. If the elevation is 2 times or more the normal range, intervention such as medication is required. In general, an incorrect lifestyle, such as excessive late nights, inappropriate exercise, and a poorly structured diet, may lead to a small elevation of alanine aminotransferase, which can recover on its own by adjusting the diet and regular work and rest. However, if the elevated alanine aminotransferase is caused by pathological factors, such as viral hepatitis, alcoholic liver, drug-related hepatitis, etc., it is necessary to promptly visit the gastroenterology department of a hospital and actively treat the primary disease before it can come down. Patients should properly participate in outdoor physical exercise in daily life to enhance personal fitness, but should not engage in strenuous exercise until liver function is restored to normal. Diet should not eat too greasy food, and should be based on a light diet, such as green leafy vegetables and fruits.