I rate the “sugar doesn’t make your kids hyper” thing as sort of true: actual double-blinded studies have shown that getting “sugar”, by itself, doesn’t have any effect.
Thing is, those were blinded studies - the kids don’t know who is getting sugar.
However, what I think does potentially have an effect, is the excitement of getting a candy or some cake. In addition, the occasions at which kids get sugar in large, visible doses are often occasions which are inherently exciting - like birthday parties. So, there is an association that a blinded study would not pick up.
Though parential perceptional bias also may play a part …
It could. And I can’t say for certain that my own observations aren’t biased.
But my experience tells me that a psychiatrist who says “Hyperactivity is NOT caused by sugar intake and won’t be helped by a low-sugar diet” AND a suburban Mom who says, “My daughter goes bonkers for an hour after she drinks a Coke” are probably BOTH right, because they’re actually talking about different things.
I think the advice is to keep people from messing with baby wildlife. If you tell somebody it’s OK to touch an young wild animal, they might actually touch it, pick it up, play with it, something. By telling people it will harm the animal, that mommy will let it die if you pick it up, it prevents a certain amount of harm.
Despite the best efforts of a whole bunch of Brain Scientists, we really don’t know what they mean, or even when they occur (it’s ~90% during REM sleep, ~10% other)
Which is why I think this is the perfect example for this thread.
Speaking specifically, numerous replicated studies have demonstrated that parents’ perception of their children’s activity level is highly correlated with whether the parent believes that the child has had sugar (usually with a blind control of a sugar substitute, sometimes by the sugar (or not) being given “offscreen” from the parent), and correlates not at all with whether the child actually had the sugar.
That’s not strictly the same as saying sugar has no effect on kids behavior, just that it has no effect on kids behavior that a sugar free equivalent wouldn’t have.
This isn’t really in any doubt, scientifically (the study’s been replicated a number of times in different forms), but most parents find it really, really hard to believe.