You want carbs, but you don’t need to subscribe to the high school track team model of a huge pasta dinner. Eat meals that combine complex carbohydrates with a little bit of protein and fat. Spread out your calories over the day, and consider having your biggest meal at lunch so you have time to digest. A big meal right before you go to bed can keep you up. And go easy on beans and foods that are high in fiber and might give you gas or indigestion. You don’t want to have to majorly unload during the race.