Keeping children off of sugar is rather challenging. We had our young kids on a nearly zero sugar diet for a couple years, but they had really strong behavioral reactions to even small amounts of sugar (e.g., three starbursts) given to them by friends or adults. We have slightly increased their sugar consumption (e.g., maple syrup on pancakes) and they don't have the same reaction to small amounts of sugar. Not our favorite trade-off though.
You know, there's no (non-psychological) link between sugar and hyperactivity- it's basically the same as giving kids fizzy applejuice, saying it's beer and watching them get "drunk". They act hyperactive because they expect that sugar will make them hyper; thus they do.
