Inclusion Criteria:  Male and Female Established IBD diagnosis (both well-controlled and active disease) for > 6 months Followed by the Children's Hospital Colorado (CHCO) IBD Center Ages 8-18 years  Exclusion Criteria:  Vegan diet Exclusive enteral nutrition (EEN) currently or within 2 weeks of enrollment History of full colectomy Ongoing active gastrointestinal infection Severe malnutrition (BMI less than 5th percentile) Presence of ostomy Recent medication changes