Suger doesn't make kids hyper, it's the excitement of the party, that usually gets them hyper.
There was an experiment on tv recently showing children whose parents said suger made them hyper going to a party. The food laid out was a ll sugar, cakes fizzy drinks etc. When the parents left it was swapped for very healthy snacks. The party had lots of clowns and noise and the children were allowed to get very excited.
Parents picked them up claimed children were on a sugar high.
Next week same children different party, this time parents show healthy food. Food swapped for sugar fest when parents went, however very quiet party,
Parents commented on how calm children were, when told they had been eating sugar all afternoon, they were astonished.