yeah that makes sense, poor kiddo! it's a bit different than the "what they eat for breakfast" angle though. Maybe I'll ask in a new thread, I don't want to go OT here but I'd be interested to hear from others.
I don't know if breakfast matters so much, but the amount of sleep a kid got might affect things. NurtureShock talks about sleep, too. Kids in one high school managed to score a lot higher on their SATs when the school decided to just move the start of the day forward by one hour (or something like that.)
I know my scores were affected when I had some appendicitis going on and no one knew I had it at the time...