The Impact of Modified Wheat Bran on Carbohydrate Fermentation in the Colon in Healthy and Obese Subjects

Inclusion Criteria: * Aged between 18 and 65 years old * BMI between 18 and 25 kg/m² OR higher than 30 kg/m² * Regular diet * Not dieting Exclusion Criteria: * Use of antibiotics in the month preceding the study * Diabetes Type 1 or 2 * Abdominal surgery (except from appendectomy) * Use of medication that affects the gastrointestinal tract during the last 2 weeks prior to the study including spasmolytics, anti-diarrhoea medication, anti-constipation medication * Use of pre- or probiotic supplements in the month preceding the study * Chronic gastrointestinal diseases, such as inflammatory bowel disease (Crohn's disease, ulcerative colitis), irritable bowel disease… * Pregnancy or lactation * Blood donation in the last 3 months * Abnormal Hb-level (Standard range between 14 and 18 g/dL for men and between 12 and 16 g/dL for women) * Participation in clinical studies involving radiation exposure in the past year