The physical examination requires fasting for at least 8 hours. The night before the physical examination should pay attention to a light diet, try not to eat after 8 p.m. The day of the physical examination requires an empty stomach, and try not to drink water. In the days before the physical examination must also pay attention to a light diet, eat less high-fat, high purine food, so as not to affect the blood lipid or kidney function test results, because there may be high triglycerides, cholesterol or uric acid. Also, be careful to try not to drink alcohol, which is mainly metabolized in the liver and can affect the examination of glutathione, glutamic oxalacetic aminotransferase or bilirubin. So an important note for the physical examination is to pay attention to fasting, because there are special requirements for blood sugar, lipids and other indicators, and fasting is also required for the ultrasound examination of the liver, gallbladder, pancreas, spleen and kidney.