I heard a great idea once (I think it was from my drama teach in middle school) about how to avoid eating so much candy during Halloween:
She said that her and her husband taught her kids about the Great Pumpkin (kinda like Santa Clause or the Easter Bunny) and how every year he would come and leave the kids presents in exchange for their Halloween candy. So every year her kids would dress up, go trick-or-treating, come home, pick out five pieces of candy (to keep), and then put the rest of their candy into their newly carved jack-o-lanters for the Great Pumpkin.
That night the Great Pumpkin would come, take the candy, and leave a present.
The next morning the kids would wake up to find their present (maybe PJs, toy cars, or new shoes... something small) which was left by the Great Pumpkin.
What about the candy? They (the parents) would throw it away! The kids don't need it and neither did they!
I think it's a brilliant idea!