Medical checkups are generally not allowed to eat breakfast, and they are becoming more and more important in modern society, as they can check the basic health conditions of the body and are of great significance in screening for the risk of tumors and cardiovascular and cerebrovascular diseases. The requirement of the physical examination is not to eat breakfast in the morning, because the physical examination program usually includes blood tests, blood sugar, blood lipids, etc., after the diet will lead to a significant increase in fasting blood sugar, and will lead to a significant increase in cholesterol and triglyceride levels, affecting the test results, leading to errors in the doctor’s judgment, and even affect the entry, causing unnecessary trouble. When doing liver and gallbladder ultrasound is also required not to eat breakfast, because in the time not to eat breakfast gallbladder is not emptied, when the liver and gallbladder comparison is better.