In my first Ride to Cure, I wasn't thinking much about nutrition and food (mostly, just quick acting carbohydrates for blood glucose levels). It is listed right up there at the top of my many mistakes before doing a century ride in extreme conditions (which, just so happens, a few of you will be doing next weekend!).
So, take this as what it is, simply: a non-professional cyclists food advice.
Eat a mix of food offered on the course. Do not stick with one thing. Be sure to eat those peanut butter and jelly sandwich halves at each stop. The shot-blocks and clif bars, and what not are good for a quick pick me up, but you really need some slow/complex food to digest. I'm not talking oats and granola. I'm talking small amounts of carbs w/ protein of some sort. Remember this at mile 67 - peanut butter sandwich is your friend! They have them out there for a reason.
Same goes for the drinks... don't just keep consuming energy drinks all day. Give your body some plain old water as well. A good routine might be water during riding time and energy drink at the stopping points. (a little shout out to our team sponsor here: XS Energy Drinks! - love 'em, just not ALL the time).
Even if you don't follow my advice, be sure you have a good plan of how you are going to handle food while you are riding on the course. 100 miles takes a while and your body needs nutrition.
Like I said, I had not thought about it much before my first century attempt in Death Valley and by mile 60, my stomach was a mess and the fast carbs were flying through me because I didn't have any of the slower digesting foods in my body. I paid a lot more attention to what I was eating on my 2nd attempt and feel those little peanut butter & jelly sandwich halves were the thing that got me through (ok, to mile 87).
I'd like to hear comments from other veteran riders about what you ate on the course when you rode. Mistakes you made?