Gluten Ingestion Biomarkers in Patients w Gluten Sensitivity and Healthy Controls Peptides in Patients With Non-celiac Gluten Sensitivity and Healthy Patients: A Placebo-controlled Study

Inclusion criteria include * Patients \> 18 years of age * Patients willing to maintain gluten free diet for 6 weeks Exclusion Criteria (NCGS): * Patients \< 18 years of age * Patients with positive serology suggestive of celiac disease and/or biopsy-proven celiac disease and/or Human leukocyte antigen (HLA) DQ2 or DQ8 positivity. * Patients with a diagnosis of inflammatory bowel disease * Patients with a diagnosis of acute gastroenteritis * Patients who are pregnant * Type 1 Diabetes Mellitus Exclusion criteria (healthy controls): * NCGS * Celiac disease * Inflammatory bowel disease * Irritable bowel syndrome * Acute gastroenteritis * Patients who are pregnant * Type 1 Diabetes Mellitus