What you eat, when you eat and how much you eat before are all very important parts of bike racing. If you eat too little you won't have the energy you need to race well.
If you are going to be in a bike race and you want to race well then you need to do a few things to prepare ahead of time. Of course you need to train and train hard. You need to make sure to warm up. Bring everything with you that you could possibly need to your races, you never know what could happen. Just as important is what, how much and when you eat the day of the bike race.
I don't mean what kind of food do you eat every day while you are training for the bike race, although that's important too. What I'm talking about is what you eat and drink the day of the bike race.
Of course you know you have to eat before you go on a long bike ride or race in a bike race. If you don't eat enough you will "bonk". That's the technical term for running out of energy and feeling generally not well. It happens when you haven't had enough to eat or drink.
Find out what Lance Armstrong eats.
*This is a general guideline and not a scientific or professional outline.