 The occurrence and severity of fullness, reflux and dyspeptic symptoms will be recorded contemporaneously by participants for three hours after each of the four test meals using a mobile application SymTrack, Gastric Imaging Analysis GmbH, Zürich, Switzerland. Paper forms will be made available for those without a mobile device. Three hours is the period of time during which reflux and dyspeptic symptoms are most often reported after meals. Positive reporting bias will be minimized by automatic reminders sent to the participants by the SymTrack every 30 minutes for three hours to remind participants to document the severity of symptoms including, if appropriate, an absence of symptoms. The use of the rescue medication to treat reflux and dyspeptic symptoms during the study will also be documented on the SymTrack. Symptoms and use of the rescue medication that occur after this three hour period up to 12 hours i.e. the following morning will be documented as part of safety follow-up data; however these will not contribute to primary or secondary outcomes. 