If you eat breakfast, it will definitely have an impact on the relevant examination items, such as fasting blood sugar and blood lipids are strictly prohibited to eat breakfast, if you eat breakfast, blood sugar will be significantly higher, triglycerides will be significantly higher, cholesterol may also appear elevated phenomenon, after eating breakfast gallbladder contraction, bile evacuation will affect the ultrasound results of the liver and gallbladder. There are many items that cannot be performed after breakfast, such as gastroscopy, colonoscopy, and upper gastrointestinal barium meal examinations. Items that can be performed after breakfast, such as electrocardiogram, lung CT or lung frontal and lateral radiographs, cranial MRI or cranial CT, and arteriosclerosis level examination, are not affected.