 This research project is designed to compare three new investigations of stomach function using a relatively large meal. This information will help to explain the causes of symptoms after a meal. The investigations to be tested include: 1 Nutrient Drink Test, 2 Gastric Scintigraphy and 3 Magnetic Resonance Imaging. All three tests are safe, easy to perform and non-invasive i.e. do not involve inserting catheters through the nose and into the stomach or taking blood. The results should provide more useful information to doctors looking after patients with dyspeptic symptoms. 