Athletes, coaches, and scientists have long known that meal timing affects distance running performance. Knowing when to eat before a cross country race is vital as going for a long intense run with a stomach full of food can lead to anything from discomfort to all out vomiting. Digestion calls for the re-directing of blood to the small intestine, while running calls for a re-directing of blood to the working muscles. See the problem? The systems of the body are in conflict at this point and the muscular system usually wins out in the struggle for blood, hence the issues with the stomach and intestine. On the other hand, going for a long or intense run on an empty stomach has its issues as well….