I know this question is long dead but I felt compelled to chime in since the answers provided were incredibly wrong.
I can explain this phenomenon for you very easily:
1) A calorie is a unit of energy.
2) When you consumes a piece of broccoli your body uses energy to break it down.
3) Raw broccoli is much harder to break down than cooked broccoli therefore it uses up more energy.
4) Since the raw broccoli is using more energy to be consumed, it's calorie count is lower than cooked broccoli.
Last edited by eddiewu80; 08-10-2012 at 07:52 AM.