I heard many times the line that sugar causes hyperactivity, but after having children, and giving sugary-foods to them (yes, I love sweets..), I never saw them getting hyperactive, so I decided to investigate a little bit.
And this is what I found:
There is a great study in which parents who thought their kids were sugar-sensitive were asked to rate their child’s behavior after the children had consumed soda. Parents who heard that their children received sugar-sweetened sodas rated the youngsters’ behavior significantly worse than those who were told their kids drank artificially-sweetened soda. The catch? All the kids in the study consumed artificially-sweetened sodas, so no sugar.
This other study, a meta-analysis has studied this question and reached the same conclusion that eating sugar doesn't make children hyperactive. Each study was randomized, placebo-controlled, and double-blind. But A particularly troublesome finding was that for some children, if they were told that sugar would make them hyper, then they actually would become hyper after thinking that they had eaten sugar.
Usually when children are receiving sugar is a time when they are more prone to be active, not because of the sugar but because of the circumstances.
In medicine the fact that two things go together (correlated) does not mean that one causes the other (correlation does not mean causation).
Still not convinced? If after looking at everything else in your child's life you still feel food is causing an adverse reaction, your first step should be to consult with your child's doctor. Extreme approaches, such as eliminating whole groups of foods, can do more harm than good, especially in children.