Breakfast 350 - scrambled eggs with a little parmesan, small smoothie.
2 fricking cokes - 240 (sorry Dan but it's less than 2 plus a kerns).
Lunch - 500 - "Gourmet vegetarian Mac and Cheese" from the nVidia cafe. Bringing lunch is going to be a must even if just for measurement's sake. It wasn't very cheesy at least.
Snack - 2 bananas. 200.
Dinner - 700 Mushroom Spinach Enchiladas
Beer 210 (Sierra Nevada Torpedo.
That's 2200. I didn't ride today. Of course, that's a sort of wack statement given that "not riding" means I just rode to and from the train stations to home and work, which actually ends up being ~20 miles. So on the whole, I was in a decent deficit for the day, probably more than 500 calories.
This exposed a little problem Weds AM. While I may want X amount of calories per day which is basically BMR + Exercise Cals - 500. But the timing is also important. Specifically it might be reasonable to eat the "Exercise Cals" a day ahead of time. This can be a problem if external factors torpedo your century ride after you've gone to Olive Garden's all you can eat Pasta.
Not "pre-eating" those calories when y ou do need them is a bigger problem. I got up, had a bowl of cereal, and went to the Google Ride. I expected a bit of dutch tempo, instead it was a fast tempo with several crazy surges on Tunnel, at SFO, Coyote Point, etc... Underfed, I was struggling with the surges, but by Palo Alto I was in a serious problem. I limped to Sunnyvale and stopped for food. The workout was probably less effective than it could have been and was definitely less fun with my stomach trying to eat itself.