I don't right now, but from my times when competing, I used to read a lot of science based research on nutrition and there was a study that said swishing a carb rich liquid was enough to trigger it.
I think I first saw it referenced on an old edition of 'The Complete Guide to Sports Nutrition' by Anita Bean
What I meant was there is a possibility of it happening as a sweet taste (parent didn't mention sweeteners, just sweet taste) response since there is a similar response to carb rich drinks (study didn't mention the kind of carbs so no idea)
I think I first saw it referenced on an old edition of 'The Complete Guide to Sports Nutrition' by Anita Bean