As a kid, when sugar came around and other kids would get hyper, it always had this effect on me and I was really confused.
But some of that may have been environmental because I had experience with hyper friends breaking my stuff and so learned to be cautious, so I might have developed increased caution in response to stimulation for non-physiological reasons.
Do they, as far as you're aware, have this opposite effect one some people - but it's not considered to be correlated to whether they have ADHD?