While i totally agree that it is a problem in some children, on the flip side though, I have been to a few parties where there has been nothing but healthy food served (and this is a rare occurance let me tell you) and the kids still do get hyped up from excitement, so it would be hard to tell just how much of their hyperactivity is related to the food they have eaten, or just becuase it is a party IYKWIM?

It would be interesting to have a group of kids and have one party with the usual stuff and then another party with only healthy and see what the difference is.