Partial Enteral Nutrition as Therapeutic Augmentation of Advanced Pharmacological Therapy in Patients With Active Crohn's Disease

Inclusion Criteria: 1. Ability to provide informed consent 2. A confirmed diagnosis of Crohn's disease 3. Plan to start one advanced Crohn's Disease therapy (anti-TNF, anti-IL12/IL23, anti-IL23, anti-alpha 4 beta 7, JAK inhibitor). 4. If taking aminosalyilates, methotrexate or thiopurines, participant must be on a stable does for at least 8 weeks prior to screening. Methotrexate, aminosalicylates and thiopurines are permitted to be continued with the advanced therapy if on stable dose for at least 8 weeks. Methotrexate or thiopurines may be initiated within 1 week of starting the advanced pharmacologic therapy 5. Active disease defined by at least one of the criteria from group A AND one from group B. Group A 1. Short Crohn's Disease Activity Index (sCDAI) score \>175, and if taking corticosteroids, dose cannot exceed 30 mg for prednisone or 9 mg for budesonide, 2. sCDAI \< 175 and on 10- 30 mg of prednisone (or 6-9 mg of budesonide) at a stable dose for 2 weeks. Must have experienced worsening of symptoms with attempts to taper to a lower dose of steroids in 3 months prior to screening. Group B 1. Fecal calprotectin at baseline ≥ 300 ug/gr 2. Active disease seen at colonoscopy within 8 weeks of the screening visit. Active disease requires presence of mucosal breaks including either diffuse scattered erosions or at least one ulcer (\>5mm diameter) 3. Active disease on cross-sectional imaging (CT scan, MRI or ultrasound) within 8 weeks of the screening visit (evidence of acute inflammation, such as ulceration or bowel wall thickening with restricted diffusion) Exclusion Criteria: 1. Pregnancy or breast feeding 2. Presence of an ostomy 3. Previous total colectomy 4. Short gut syndrome from prior surgeries 5. Consuming parenteral nutrition for more than 350 calories per day in the two weeks prior to screening 6. Having been on the Crohn's Disease Exclusion Diet (CDED) in the 2 weeks prior to screening 7. Plan to receive two simultaneously administered advanced therapies 8. Planning to start a new medication in the same class as the medication currently taking. This does not include a switch from Ustekinumab to anti-IL23 drugs. 9. Impending need for CD surgery per investigator 10. Symptomatic stricture or stricture inducing bowel dilation (\>3cm) as per local investigator. 11. \>4 very soft or liquid bowel movements per day when feeling well 12. Diabetes mellitus requiring therapy with medication 13. Known allergy to any ingredient in the Kate Farms formula. 14. Unable to complete online surveys 15. Unable to receive shipments of PEN formula. 16. Starting a new medication for Crohn's disease other than steroids in the 8 weeks prior to the screening visit 17. Has not consumed food in the last 6 days prior to screening 18. Starting an accelerated (non-FDA approved) dose of advanced therapy 19. At time of screening, participant is taking both Prednisone and Budesonide 20. Untreated C. difficile infection with the last 8 weeks