False! Twelve controlled, double blind trials have shown that there is absolutely no connection between children's behavior and their sugar intake. One thing was found, namely that parents rate their child's behavior as more hyper when they thought they had been given a sugary drink. "The studies included sugar from sweets, chocolate and natural sources. Even in studies of those who were considered “sensitive” to sugar, children did not behave differently after eating sugar-full or sugar-free diets," said Vreeman and Carrol who undertook the retrospective study.