Eating dates the day before a colonoscopy could potentially affect the accuracy of the results if the residue from the dates is not removed. On the day before a colonoscopy, it is usually necessary to eat some non-residue foods because these non-residue foods can be well removed in the subsequent intestinal cleansing and will not remain in the intestines to affect the accuracy of the colonoscopy results. However, dates are rich in fiber, which is not easy to be eliminated. Date residue left in the intestinal lumen may interfere with the test results. The day before the colonoscopy should try to avoid eating foods rich in dietary fiber such as red dates, celery, leeks, etc., and you can eat more nutrient-rich, non-dregs diet, such as steamed eggs and rice porridge. If you need to have a colonoscopy, it is recommended to seek medical attention in time, have a reasonable diet and make intestinal preparations under the guidance of the doctor to promote the smooth progress of the colonoscopy.