 Background: Porridge breakfasts from various grains are a staple source of energy for many populations worldwide. The grains used in the porridges differ between regions, mostly due to the crops historically grown. For example, oats are more common in the Anglo-Saxon countries; rye is traditional in the Scandinavian countries whilst millet is very common in parts of India and Africa. Porridge consumption is very popular: 78 of South Africans eat porridge; 49 of British people eat porridge with 23 doing so almost daily; 62 of U.S. households buy hot cereal breakfast and the hot cereal segment is the best performer within the breakfast cereals market in the UK. Consumption of whole grains has been associated with a variety of health benefits ranging from lower blood glucose levels, improved insulin responses, reduced cholesterol and increased diversity of the microbiota. Of particular interest to this study are recent suggestions that different grains, and particularly millet grains, may have enhanced health benefits on glucose and insulin metabolism. This may be due to different rates of digestion and absorption, for example, because of grain specific differences in starch digestibility. This could affect gastric emptying and, in turn, post prandial glycaemia and impact on satiety. However little is known about possible differences in gastric emptying between breakfast porridges from different grains and possible relationship with glucose, insulin and appetite. 