I certainly agree there's a connection from the gut to the rest of our body (including mood) that we still don't understand... But I'm curious if you've done anything to rule out psychosomatic ? I saw a brief mention that you think there is a link to childhood experiences, which means you do agree there might be a mental connection... Have you tried a blind experiment at all? I could see it being relatively possible if you had someone prepare something liquid, steps were taken to conceal the flavor, and perhaps using a straw to limit how much you can notice.