I was pretty sure that the kids + sugar behavior change was debunked and all up to expectations from the parents.
Now, this is not a study but covers what I thought was the case since years back:
>The sugar-hyperactivity myth is based on a single study from the mid 1970's in which a doctor removed the sugar from one child's diet and that child's behavior improved. Since then, over a dozen larger studies have been conducted and not one of them has found that sugar causes hyperactivity. Interestingly enough, researchers have found that parents are more likely to say that their kids are overly active when they think they've consumed sugar.
And anecdotally, both my partner and I can recognize adverse psychological effects in myself after I consume too many high-glycemic carbs (ie, sugar).