Reliability of a Food Frequency Questionnaire in the Assessment of Dietary Intake Including FODMAPs in Different Populations, and Relationship With IBS Symptoms and the Degree of Self-assessed Physical Activity

Exclusion Criteria

• •Diet \< 8 weeks prior to participation;
• •Known or suspected eating disorder;
• •Major psychiatric disorder;
• •Known gastro-intestinal disease (IBS is allowed);
• •Any malignancy in the past 3 years (basocellular carcinoma is allowed);
• •Chemotherapy in the past 6 months;
• •Infectious gastro-enteritis in the past 6 months (infectious gastro-enteritis defined as the concurrent presence of one of the following signs during 2 or more consecutive days: fever, vomiting, sudden onset of diarrhea, hospitalization because of these symptoms);
• •Previous abdominal surgery (appendectomy and cholecystectomy are allowed);
• •Alcohol abuse defined as \> 14 U per week;
• •Use of illicit drugs;
• •Intake of drugs with known major gastro-intestinal side effects.
• •Initiation of neuromodulators less than 3 months before participation. Neuromodulators are allowed when taken at a stable dose for at least 3 months;
• •Pregnancy.