A low residue diet versus clear fluids prior to colonoscopy. The impact on bowel preparation quality and tolerability.

This study is comparing two different diets the day before a colonoscopy: a low-residue diet (which includes certain solid foods) versus the traditional clear fluids only diet. A colonoscopy requires the bowel to be completely clean for a clear view. Researchers want to find out whether allowing some solid food makes the preparation experience more comfortable without reducing how clean the bowel is, compared to clear fluids alone. You may be eligible if: - You are 18 years of age or older - You are scheduled for an outpatient colonoscopy for a standard clinical reason You may NOT be eligible if: - You have a suspected bowel perforation, bowel blockage, toxic megacolon, or severe colitis - You are pregnant or breastfeeding - You have significant kidney failure (eGFR below 30) or severe heart failure (NYHA Class III or IV) - You have phenylketonuria (PKU) or G6PD deficiency - You have a known allergy to any ingredient in the bowel preparation solution Talk to your doctor about whether this trial might be right for you.