Jim,
Many people suffer headache from beer as a result of a naturally occurring amino acid called Tyramine that is present to greater or lesser degrees from brand to brand, but still always there. This is also present in high concetrations in many cheeses, so beer and a pizza is a killer for some folks. Other low sulfur fuels such as red wine have a fair amount of the stuff, while white wines tend to be high in sulfur, and those sensitive to sulfur will have severe headache with white wine, but not red, and similarly, with agricultural diesel, and not auto diesel. If you have a true allergy, you can expect something to happen like the response your uncle gets, so you should probably try your experiment around others, not alone...but who wants to drink alone anyway?
