Reverse-Engineering of Exclusive Enteral Nutrition (RE-EEN) in Crohn's Disease: A Multi-Center Trial

Inclusion Criteria: * Age 8 -21 years old. * Diagnosis of Crohn's disease within 24 months * Elevation in objective inflammatory markers at enrollment: C-reactive protein (CRP), ESR, or fecal calprotectin * Active Crohn's disease, as defined by Pediatric Crohn's Disease Activity Index (PCDAI) ≥10. * Participant capable of giving informed consent, or if a minor the parent/guardian is capable of giving informed consent. Exclusion Criteria: * History of surgery for Crohn's disease. * Perianal disease as part of Crohn's disease phenotype. * Recent use of: * corticosteroids (within 4 weeks), * dose adjustment of immunomodulator (within 8 week) * azathioprine 4 weeks prior to study final visit (week 8) * start or adjust methotrexate 3 weeks prior to final study visit. * Prior use of biological medication * Prior treatment with EEN or other dietary therapy for Crohn's disease. * Prior treatment with antibiotics for Crohn's disease. * Known allergies to any of the food components in the smoothie. * Admission to hospital due to severity of Crohn's disease and associated symptoms. * Unwillingness to provide informed consent.