The purpose of this research study is to collect different types of samples (such as stool, swabs, urine) to form a biorepository.

Evaluate the impact of non-persistent and persistent chemical exposures on autoimmunity, gene expression and the microbiome in children with and without Crohn’s disease.

This study looks to assess how celiac disease affects the quality of life of patients between the ages of 13-18.

This study hypothesizes that a flexible dietary intervention of excluding processed and pro-inflammatory ingredients will improve the rate of clinical remission and mucosal healing in Crohn's disease patients, without the need for liquid formula or structured rigid diet.

The purpose of the TII study is to see how the prebiotic inulin changes the gut bacteria (microbiome) of children and young adults (ages 8-21) with IBD and determine if this dietary intervention can help reduce disease activity.

The purpose of this research study is to help us understand how well tofacitinib works as a treatment for ulcerative colitis or indeterminate colitis in pediatric patients.

The purpose of this research study is to identify genes that are involved in the development of Inflammatory Bowel Disease (IBD) at a young age (less than 8 years of age).