Pre-packaged Low-residue Diet for Bowel Preparation in Patients With Inflammatory Bowel Disease

Inclusion Criteria: * Age: Adult patients between 18 and 75 years old; * Diagnosis of IBD according to the 2023 Guidelines for the Diagnosis and Treatment of Inflammatory Bowel Disease; * Voluntary participation in this clinical trial and provision of signed informed consent. Exclusion Criteria: * Patients with acute IBD, severe conditions, combined with major bleeding, suspected toxic megacolon, CD with severe intestinal stricture, gastrointestinal obstruction, or other conditions deemed unsuitable for colonoscopy by the physician; * Patients with severe cardiac, pulmonary, hepatic, or renal dysfunction; * History of previous colorectal surgical resection or use of medications that may affect intestinal motility within one week (e.g., antidepressants, sedatives, calcium channel blockers); * History of stroke, spinal cord injury, or psychiatric disorders that impair compliance with bowel preparation and colonoscopy; * Allergy to any component of the administered drugs or meal replacements; * Pregnant or lactating women, and other individuals considered unsuitable for bowel preparation and colonoscopy by the physician.