jezebel777_999 says:

It's cliche, but the night before your race you should have a carbo loaded dinner like pasta. I like to add a little protein to balance it out. Also make sure to eat dinner at a normal hour and get to bed early. Also make sure to hydrate throughout the day. For my last 1/2 marathon I packed at least two Gu (gel packs) in my belt, and I'm also a fan of the powerbar gel blasts which are small gummies that provide small bursts of fuel. For breakfast I like to stick to raisin toast, a wheat bagel, or oatmeal with a banana. Most recommend eating at least an hour before you run (which is also a good idea for digestion BEFORE you're on your 13 mile race). Hope this helps.