Dietary Triggers of Gastrointestinal Symptoms in IBS Patients

Inclusion Criteria: * IBS diagnosis based on Rome IV criteria. * Previously improved while on a gluten-free diet. * Compliance with the study procedures (according to the investigator's own judgement). * Signing the Study Informed Consent form. Exclusion Criteria: * Concurrent systemic disease and/or laboratory abnormalities considered by investigators to be risky or that could interfere with data collection. * Concurrent organic gastrointestinal disease (i.e. Celiac disease, Inflammatory Bowel Disease, peptic ulcer disease, etc.) other than benign polyps, diverticulosis, hemorrhoids, lipoma and melanosis coli. * Major abdominal surgery with the exception of hernia repair, appendectomy, Caesarian section, tubal ligation, cholecystectomy, hysterectomy, and hemorrhoidectomy. * History of active cancer in the last 5 years, other than skin basal cells cancer. * Pregnant or breastfeeding women. * Current use of antibiotics or antibiotic treatment within 1 months before the first visit. * Consumption of probiotics within 1 month prior to the first visit. * Use of non-authorized medications (see Unauthorized Medications section). * Patients on a high fibre diet (\>35 g/day for males, \> 25 g/day for females), consuming high inulin containing foods (\>5 g/day), and/or consuming dietary fibre supplements (as assessed by dietary assessment questionnaire) in the 4 weeks prior to the first visit. * Patients currently participating or having participated in a trial within the past mont…