 This crossover study is designed to compare the gastric layering and rates of emptying and by inference rates of digestion of two different porridge meals prepared from either finely milled or flaked oats. On each of two study days, a total of 9 MRI scans will be taken, I baseline and 8 post meal, to assess gastric layering and emptying over three hours. Blood samples will also be taken periodically over the same period in order to determine changes in concentrations of circulating glucose, insulin and key gastrointestinal hormones. Participants will also be asked to complete a questionnaire at predetermined times to assess feelings of satiation. 