Discipline of Medicine and National Health and Medical Research Council of Australia (NHMRC) Center of Research Excellence in Translating Nutritional Science to Good Health, The University of Adelaide, Royal Adelaide Hospital, Adelaide, South Australia, Australia. Discipline of Medicine and National Health and Medical Research Council of Australia (NHMRC) Center of Research Excellence in Translating Nutritional Science to Good Health, The University of Adelaide, Royal Adelaide Hospital, Adelaide, South Australia, Australia; Section for Neuroendocrine Gastroenterology, Division of Gastroenterology, Department of Clinical Medicine, University of Bergen, Bergen, Norway. Section for Neuroendocrine Gastroenterology, Division of Gastroenterology, Department of Clinical Medicine, University of Bergen, Bergen, Norway. Discipline of Medicine and National Health and Medical Research Council of Australia (NHMRC) Center of Research Excellence in Translating Nutritional Science to Good Health, The University of Adelaide, Royal Adelaide Hospital, Adelaide, South Australia, Australia. Electronic address: stijn.soenen@adelaide.edu.au.