I have not been diagnosed but they elimination have found them to be the culprits of by bouts of extreme stomach cramping and light headedness. The thing is the symptoms aren't always severe. Is anyone else experiencing this? Have you found anything that helps other than trying to avoid them?
I often have reactions (mouth) to raw onions, but I can tolerate them cooked, usually, although they will upset my stomach sometimes.
I get horrible gas and sometimes cramps and diarrhea with onions. I find spring onions work better. Often I cut onion chucks up bigger for family that want it in a dish.