Well, as long as we're talking about beer and strange medical impacts; I have found when I drink heavily oaked (or even medium oaked) beers that I get heart burn. Seriously oaked beer results in seriously bad heart burn.
I'll also add that on two differnet ocassions in Munich I drank probably more beer than I've ever had in a sinle day and I had NO headache the following day. -And I'll add that I had Paulaner that day, too but it was the Oktoberfest/Maerzen variety and not a Weissbier.
I hate to attribute it to the Rheinheitsgebot as I think it's really holding back German beers, but I'm "batting 1000" with German beers and a lack of a hangover, to use a seriously overused American sports metaphor...
Adam