Assessment of Pouch Emptying With MRI After Roux-en-Y Gastric Bypass

Inclusion Criteria: * Women aged between 20 and 55 years * Patients must be able to adhere to the study visit schedule and protocol requirements * Patients must be able to give informed consent (IC) prior to any study procedures * Patients who had a follow-up period up until two years after LRYGB and have successful or unsuccessful weight loss. * Willing to be informed about incidental findings of pathology and approving of reporting this to their general physician Exclusion Criteria: * Diabetes Mellitus * Menopausal * Gastrointestinal problems, gastric or intestinal diseases * Drug or alcohol addiction * Inability to stop smoking during the overnight fasting period * Pregnant or lactating * Having an intolerance or allergy for one of the components of the test product * Inability to stop medications that affect gastrointestinal emptying like antisecretory drugs, narcotics and prokinetic agents * Inability to stop medication that affects the motility of the upper gastrointestinal tract (anti-cholinergic drugs, prokinetics, theophylline, calcium blocking agents, opioids) * Having a contra-indication to MRI scanning (including, but not limited to): * Pacemakers and defibrillators * Intraorbital or intraocular metallic fragments * Ferromagnetic implants