Kinda hard to describe but its a feeling of "intensity" when you put that first bite of food in your mouth. I first noticed it when I'd pop that first table grape in my mouth and always attributed it to the sugar as it was usually something sweet. But now I'm getting that same reaction from cheeses. Its not an unpleasant feeling at all...it just kinda makes me almost freeze up for a second and almost make a "face" if you will. I don't recall experiencing it at all when I was young.