Four days before the procedure, the patient must eat a fiber-free diet (avoid beans, bran, corn, granola, etc.). The day before your diet will be exclusively clear liquids (chamomile, Gatorade, Powerade, clear soft drinks; strained and fresh clear broths, without seeds). You cannot eat any type of solid food, crackers, or pureed vegetables. Is prohibited at all.
In the night before the exam and during the early morning, you must ingest a laxative, to cleanse the colon of the remains of stool that prevent an adequate evaluation of the organ.
To fully carry out the preparation before the study, it is advisable to read carefully the text of the following link:
Preparation for Colonoscopy
Video of the preparation (long version)
Video of the preparation (short version)