Nutrition on the road - What, How and Why?

Paul de Vivie devised a code for the wise cyclist:

1. Keep your stops short and few.
   
2. Eat before you're hungry, drink before you're thirsty.
   
3. Never get too tired to eat or sleep.
   
4. Add a layer before you're cold, take one off before you're hot.
   
5. Lay off wine, meat and tobacco on tour.
   
6. Ride within yourself, especially in the first hour.
   
7. Never show off.
   
   

His wiki page is rather nicely done and worth reading.