Personalized Research on Diet in Ulcerative Colitis and Crohn's Disease

Inclusion Criteria: * Diagnosis of Crohn's Disease (CD) or ulcerative colitis (UC) or Indeterminate colitis (IC) * Age 7-18 years * Enrolled in the ImproveCareNow (ICN2) registry * Evidence of acute inflammation and/or elevated acute phase reactant as measured by Fecal calprotectin 1.5 times the upper limit of normal, Lactoferrin 1.5 times the upper limit of normal, CRP 1.15 times the upper limit of normal, or ESR 1.15 times the upper limit of normal (based on local reference ranges) obtained within 8 weeks of enrollment. * Potential participants who are close to meeting one of the acute inflammation and/or elevated acute phase reactant markers and who meet all other study criteria will be considered for study participation on a case by case basis by the investigative study team in consultation with the patient's primary gastroenterologist. Exclusion Criteria: Complex and Unstable IBD: * Currently or within the past 9 months has had an abscess, fistula, stricturing CD, or ostomy * Severe disease activity as measured by a short Pediatric Crohn's Disease Activity Index (SPCDAI) score of \>45 or Pediatric Ulcerative Colitis Activity Index (PUCAI) score of \>60 assessed within three weeks of enrollment * Ever had history of full colectomy * Hospitalization or surgery planned within 3 months * Ongoing active gastrointestinal infection * Severe Malnutrition (BMI less than 5th percentile) * Recent medication changes including: * Thiopurines, natalizumab, or methotrexate started within 8 weeks prior to enrollment * Anti TNF (infliximab, adalimumab) started within 8 weeks prior to enrollment * Vedolizumab started within 16 weeks prior to enrollment * Increase in corticosteroids within 4 weeks of screening or have dose \>20 mg prednisone or equivalent Evidence of Other Complicating Medical Issues: * Other serious medical conditions, such as neurological, liver, kidney, or systemic disease * Serious psychological or psychiatric conditions such as eating disorders or self-harm * Pregnancy * Tobacco, alcohol, or illicit drug abuse Inability to Complete the Protocol * Non-English speaking participants * On SCD or modified SCD anytime within 8 weeks of enrollment * If an otherwise eligible patient is on SCD or modified SCD within 8 weeks of enrollment but they are noncompliant per the determination of the patient's dietitian/primary gastroenterologist, then this patient is eligible to participant in the study. * Participants on a vegan diet * Lack of smart phone and data plan for participating caregiver * Participating in another concurrent intervention study