Joanna Golub, senior editor, says:
The number one nutrition rule? Dont eat or drink anything new in the days leading up to your race.
Stick to tried and true foods. That way you wont risk upsetting your stomach. The night before the race, eat a high-carb meal, but dont eat more food than you normally woulddoing so could lead to GI problems the next day. On race morning, youll be up for a few hours before the start of the race, so take the time to eat breakfast, which should consist of mostly carbslike a bagel with jam or oatmeal and some sports drink.