[1xdevnet]

I do not mean to invalidate your experience, but generally speaking it seems like both no and yes to sugar rush/sugar crash.

"Double-blind trials have shown no difference in behavior between children given sugar-full or sugar-free diets, even in studies specifically looking at children with attention deficit hyperactivity disorder or those considered sensitive to sugar. A 2019 meta-analysis found no positive effect of sugar consumption on mood but did find an association with lower alertness and increased fatigue within an hour of consumption, known as a sugar crash." [0] [1] (emphasis mine)

[0] https://en.wikipedia.org/wiki/List_of_common_misconceptions#... (yes, I know.) [1] http://wrap.warwick.ac.uk/115618/1/WRAP-Sugar-rush-crash-met...