Location Specific Differences in Intestinal Brake Activation

Inclusion criteria In order to be eligible to participate in this study, a subject must meet all of the following criteria: * Based on medical history and previous examination, no gastrointestinal complaints can be defined. * Age between 18 and 65 years. This study will include healthy adult subjects (male and female). Women must be taking contraceptives. * BMI between 18 and 25 kg/m2) * Weight stable over at least the last 6 months (≤5% weight change) Exclusion criteria A potential subject who meets any of the following criteria will be excluded from participation in this study: * History of severe cardiovascular, respiratory, urogenital, gastrointestinal/ hepatic, hematological/immunologic, HEENT (head, ears, eyes, nose, throat), dermatological/connective tissue, musculoskeletal, metabolic/nutritional, endocrine, neurological/psychiatric diseases, allergy, major surgery and/or laboratory assessments which might limit participation in or completion of the study protocol. The severity of the disease (major interference with the execution of the experiment or potential influence on the study outcomes) will be decided by the principal investigator. * Use of medication, including vitamin supplementation, except oral contraceptives, within 14 days prior to testing * Administration of investigational drugs or participation in any scientific intervention study which may interfere with this study (to be decided by the principle investigator), in the 180 days prior to the study * Major abdominal surgery interfering with gastrointestinal function (uncomplicated appendectomy, cholecystectomy and hysterectomy allowed, and other surgery upon judgement of the principle investigator) * Dieting (medically prescribed, vegetarian, diabetic, macrobiological, biological dynamic) * Pregnancy, lactation * Excessive alcohol consumption (\>20 alcoholic consumptions per week) * Smoking * Blood donation within 3 months before the study period * Self-admitted HIV-positive state * Weight \<60kg * Evidence of casein or sucrose hypersensitivity * Participation in any other study in which radiation was used, within 12 months before the study period