Sometimes I'll just have 15g flavored whey protein in a half glass of water. This stops the hunger thing remarkably well, though not always. I've also noticed that if I ride without eating, the hunger thing frequently goes away while I ride. It usually comes on at about 45 minutes, but if I ignore it, it will go away for about that long again. However, I don't ride hard when I'm doing this! If I'm going to ride hard, I need to eat something before or during. You might be able to get away with just taking a bottle of sports drink -Accelerade, Cytomax, HEED or equivalent. About 150 calories/bottle. Start sipping this as soon as you start and continue at about 1 bottle/hr.