An acquaintance that I drink beer with occasionally insists draught beer gives him a headache but bottled beer, in the same quantities, does not. He has maintained this assertion for years. He is, by the way, a very intelligent and educated person. If there is a difference, I would expect it to be in the other direction. As I understand it there are additives in bottled beer, to stabilize and preserve it, not present in draught beer. OTOH, most draught beer is not pasteurized Any thoughts?