You can’t eat before the physical examination, you should pay attention to a light diet the day before the physical examination, don’t eat high-fat, high purine food, you can’t eat breakfast in the morning of the physical examination, because the physical examination usually requires blood tests for blood sugar, blood lipids, liver function, kidney function and these items. If after a meal, blood sugar will rise significantly and fasting blood sugar is not accurate. If fasting blood glucose is greater than or equal to 7.0 mmol/L, repeated measurements can diagnose diabetes. In addition, triglyceride levels can be significantly elevated after a meal. Furthermore, ultrasonography of the liver, gallbladder, pancreas, spleen and kidney cannot be performed after a meal. Therefore, it is important to maintain a fasting state before the physical examination, especially on the day of the examination.