Also your framing ignores that the "prompting" can be circumstantial rather than targeted. The "rush" is frequently misattributed to sugar when it can actually be better explained by the food itself being a rare treat (and thus exciting) or the situation in which it is provided being special (e.g. a party). Or it can simply be the joy of eating something very tasty.

It's less Clever Hans and more "kids are more prone to sudden outbursts of strong emotions and adults blame it on food".