The night before the colonoscopy is usually able to eat, mainly fluid or semi-fluid non-slag food. Colonoscopy is a means of examination of the colon, rectum and other lesions, through this examination can be visualized, clearly see the rectum, colon mucosa and other parts of the presence of inflammation, ulcers, tumors and other lesions. Too much intestinal content is not conducive to cleanliness and may affect the effect of colonoscopy, so it is usually necessary to adjust the diet structure before the colonoscopy. The night before the colonoscopy is usually able to eat, but need to pay attention to eat to the soup, porridge and other well-digested fluid or semi-fluid diet without residue. Do not eat spicy stimulation, greasy, not well-digested food, but also do not eat high protein, high fiber and colorful food, such as spinach, tomatoes, celery, dragon fruit and so on.