Patients can eat noodles the night before the colonoscopy, but it should not be too late and the amount of food should not be too large. On the day before the colonoscopy, all vegetables, fruits and other coarse fiber foods should be prohibited to prevent the subsequent clean bowel is not clean to affect the effect of the examination, it is best to consume some porridge, noodles and other semi-liquid food, in the night before the examination needs to eat as early as possible, the amount of semi-liquid food should not be too large. On the day of the examination, fasting is generally required. In addition, there are some dietary precautions that need to be followed before the colonoscopy. 2 to 3 days before the examination, you need to pay attention to the diet with less crumbs, such as celery, kiwi and other coarse fiber foods need to be eaten less. Colonoscopy is a test used to detect changes or abnormalities in the colon and rectum. Before the colonoscopy, you need to actively communicate with the nurses and doctors in the hospital, and the duration of fasting and taking laxatives needs to be done as prescribed by the doctor. After the colonoscopy, the doctor will inform the patient of the time to start drinking and eating depending on the patient’s specific condition and whether or not a colon biopsy has been performed.