I take Gel Gu, one every hour, and also protein bar. If it is a long ride I might even carry a banana. As others have said, if you diet doesn't consist of snaking every hour, eating healthy foods, etc... doing so just for your rides may be difficult. If you are a serious cyclist, there are certainly plenty of foods to avoid that take way to long to digest or have little nutritional value. For example if you are a steak eater or pork eater, the next day you may feel lethargic when you ride. Turkey and chicken breaks down much faster and has a better nutrition then the aforementioned. You could always carry a Big Mac if you wanted....lol.