A Dose-finding and Feasibility Study for a Prolonged 13C-octanoate Breath Test for Gastric Emptying

Inclusion Criteria: * Signed Informed Consent * At least 18 years old * BMI between and including 18 and 29 * Understand and able to read Dutch * In good health on the basis of medical history * Refrains from herbal, vitamin and other dietary supplements on the day of the visits Exclusion Criteria: * Dyspeptic symptoms (assessed with PAGI-SYM questionnaire, Annex II) * Using any medication that might affect gastric function or visceral sensitivity * Known / suspected current use of illicit drugs * Known psychiatric or neurological illness * Any gastrointestinal surgery that could influence normal gastric function in the opinion of the investigator * History of heart or vascular diseases like irregular heartbeats, angina or heart attack * Nasopharyngeal surgery in the last 30 days * Suspected basal skull fracture or severe maxillofacial trauma * History of thermal or chemical injury to upper respiratory tract or esophagus * Current esophageal or nasopharyngeal obstruction * Known coagulopathy * Known esophageal varices * Have a known allergy or intolerance to cow milk, soy or any other ingredient of Isosource Standard. * Known galactosaemia