 Study day participants will not be able to eat any food after 10.00pm on the evening prior to each study day, but they will be allowed water until they go to bed. Participants will be asked to record what they have eaten on the evening prior to study day 1, and they will be asked to eat the same foods on the evening before the second study day. Participants must not consume any breakfast on the morning of the study day, but they can drink up until 7 am. The study day will start at 9 am at the Radiology Department at the Norfolk and Norwich University Hospital. After cannulation and blood sampling, initial baseline MRI scans and VAS questionnaires, the participants will eat the allocated porridge 264 g and drink the water provided 175 ml. They will then undergo 8 more MRI scans, have blood taken 8 more times and complete 8 satiety questionnaires at specific time points. 