An athlete races at peak performance by making sure the body is fueled correctly. This is not just about the morning of the start, but also approaching race day as well. Eat softer foods leading up to race. Eating foods that are high in fiber and protein can make your stomach hurt on race day. Since it takes quite a while for food to move through your system, you should start limiting these items starting about two days out. Look for softer, easier to eat foods and snacks instead, such as pasta. Eggs are a great source of protein that are easy to digest as well. A bad idea would be to eat a kale salad and steak the night before race day.