Kids' behavior: Expectations and reality

I just read a very interesting article that claims that sugar DOES NOT make kids more hyperactive. It is the parents' expectations and perceptions that make it seem so.  They references a bunch of research that had been done but the one that really struck me showed that parents who THOUGHT their kids had had sugar rated their child's behavior as much more hyper than parents who thought their kids had had a sugar free drink.  None of the kids had been given any sugar. The extra hyperness was all in the minds of the parents!

No research has been conducted on whether or not swelling up and 

turning violet because of experimental bubble gum is perception or reality.

Pic from Willie Wonka and the Chocolate Factory

Here is the article.