Microbiome-targeted Diet Therapy in Ulcerative Colitis

Inclusion Criteria: * Ability and willingness to provide informed consent * Age at least 18 years old * Diagnosis of UC based on clinical and endoscopic criteria * UC duration of at least 3 months * Ulcerative Colitis Endoscopic Index of Severity (UCEIS) score ≤4 within 90 days of randomization * On a stable dose or no existing UC therapies (apart from steroids) for defined periods (as outlined below). 1. ≥4 weeks if no medication, 5-ASA 2. ≥8 wk for immunomodulatory therapy 3. ≥12 wk for biologics * Ability to comply with study requirements in the opinion of the primary investigator Exclusion Criteria: * Moderate or severe UC as defined by UCEIS ≥5 * History of stomach surgery or bowel resection * Antibiotic use within 3 months * Anticipated antibiotic exposure during the study period (e.g. perioperative antibiotics) * Pregnancy or breastfeeding * History of anaphylactic food allergies * Intolerance of high dietary fiber content * Ongoing alcohol or drug abuse * Habitual vegan diet pattern * Insufficient freezer space to accommodate meal delivery