I found this basic info on a site when searching about nutrition for cyclists.

Eat enough calories. Do not try to lose weight with extreme calorie restrictions. You can lose weight while cycling, but you need enough fuel stores before you ride, and you need to replenish them as you ride, and after you ride. Just like thirst, by the time your body signals you that you are hungry, you are behind. If you are trying to lose weight, eat smarter. Whole grains, legumes, and balanced amounts of protein and fats will help you. Simple sugars, white flours, highly processed ìjunkî foods and alcohol are lousy fuels. They may have lots of calories, but they burn up very quickly, and donÃ*t provide a lot of energy or nutrition. The less processed, usually the better fuel quality.

Here's the link to the site. http://www.fremontfreewheelers.org/d...dNutrition.pdf