My DS (10) just told me that a number of his friends claim to be having a "sugar rush" after eating sweets/chocolate etc and run about being "hyper". I've never believed in the concept of a sugar rush and so have never suggested to my DC that it would have this effect on them. I know other parents that strongly believe in it and attribute certain behaviour in younger children is due to sugar and limit their DCs sugar intake for this reason. Presumably the DC are then behaving in the expected way by being "hyper".
I've just had a quick Google and can see that there are plenty of articles that support my POV although not necessarily conclusive on scientific grounds.
Obviously I limit my DCs sugar intake for health reasons including obesity and dental health but behaviour just isn't a factor for me.
AIBU to tell my DC that there's no such thing as a sugar rush. Do you have experience of sugar conclusively affecting behaviour in children?