I can tell you that coffee does not have the same effect (don't ask me how I know)- I think the caffeine scares the fish!Was once on a shallow reef "washing machine" dive and began feeling a bit queasy. Not much else going on and was about to call the dive when it "came up." (Sorry, TMI, but it's true, link sausage will go through a regulator.) Anyway, I became the life of the "fish party," and everyone enjoyed the rest of the dive, including me.