Originally Posted By: striker456
Not too many GMO's in beer. Malt and hops are selectively bred. And most yeast strains are naturally mutated substrains of s. cerevisiae, and not engineered. I've read of a couple of larger breweries testing with engineered strains, but nothing conclusive. You may be sensitive to certain yeast strains and some of their fermentation by products.
Most large breweries do not use clarifying agents as they either filter or centrifuge the beer, so I think it's probably not a clarifier giving you problems.
I was going to suggest you had an intolerance to wheat, but German beers tend to have wheat in them.
The last thing I can think of is I know a couple people who have an allergy to peanuts, and also have an allergy to a particular barley malt, called brown malt, that has peanut like compounds in them.
Oh, do you have issues with red wine?
Nope, no issues with red wine.