Dietary Triggers of Gastrointestinal Symptoms in IBS Patients

This crossover randomized controlled trial will evaluate the effects of purified gluten and whole wheat (gluten combined with amylase-trypsin inhibitors (ATIs)) on inducing intestinal and extra-intestinal symptoms in irritable bowel syndrome (IBS) patients. All participants will be put on a gluten-free diet and then challenged with muesli bars containing either purified gluten, whole wheat (gluten with ATIs), or gluten-free sham.