What's the best thing I can eat in the morning?

I have a VERY high metabolism and usually burn off my breakfast by the time I get to Physical Education class (it’s my 4Th period class and right before lunch). I’m always hungry when I enter the locker room and can’t preform at my best because of this.

I run laps around the track every day to help me practice for when we have to run the mile, and get in an average of seven laps (1¾ mile).
What can I eat in the morning that will stick with me until the end of fourth period?