Remember when you were trick-or-treating as a kid? There was always one old lady who would put "healthy" treats like small boxes of raisins in your bag (I usually had a pillow case and envied those kids who had the plastic pumpkin with the handle).
It turns out that some of those treats can be worse for kids because they still have sugar and stick to teeth longer than chocolate does.
So there. Just give out the chocolate. Or Sweetarts. (mmm. Sweetarts.)