This is due to enhanced oxygen carrying capacity, lower blood lactate levels, and stabilized blood sugar levels. It is one of the many great products from Cytosports for good taste, endurance, and ease of handling when biking. The best foods are fresh or dried fruits, raisins, cookies, rice cakes, energy bars, and most snack foods. The bottom line is, if you want to prevent the bonk, eat well ahead of time and continuously during breaks in your ride. A diet low in carbohydrates can reduce your performance and set you up for bonking.
Protein is also important, but most people get more than enough protein in an average diet.
Excess protein is stored as fat anyway, and not readily available for energy. As your exertion increases, your body's main source of energy switches from carbohydrates to fat. Unlike carbohydrates, your stored energy of fat reserves is almost endless. Experienced riders depend on this stored supply of body fat when their carbo's run low, and can display incredible endurance. Most of us, however, need the replenishment of the carbo's when the going gets rough and may not be able to sufficiently burn the fat quick enough.