I would like to put in my 2 cents. I believe you can easily find in scientific and medical research what sugar does to the human body. The mass consumption of sugar causes tons of problems, and children becoming 'hyper' is just one.
Sugar is like a drug, and works like a drug. It gives you a rush, and in children that might manifests in activity. I do think that other factors play a role in the fact that many children get diagnosed with adhd etc. F.e. it also has a lot to do with a sedetarian life, where they need to sit at school,. sit in front of tv, sit to play videogames, etc. And in case of placebo-effect, ...children are normally very active. So where do we draw a line and say a child is over-active? When do we say children are off the wall??
Some children just need to run around a lot every day:-)....
We have lived sugar-free for some time. And now we eat sugar. I try to watch the amount and do most cooking from scratch. I have seen my children react to high doses of sugar. It is obvious it has effect on them.
A sidenote; visiting america some years ago, I always read labels and noticed in almost all products the high fructose corn syrup. It is not like that in Europe, eventhough we consume a lot of sugar also. It made me realise that the sugar-issue is one of many where :
1Ti 6:10 For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows.
The many sorrows sugar brings is not just hyperactivity, but also heart failure, high blood pressure, diabetes, etc. All of that is treated by the pharmaceutical industry and is making people a lot of money. Even for hyperactive children they have created pharmaceutical products,...
And all the people who benefit from all those people who need to loose weight, ... Count it all up.