I had to give up hard boiled and scrambled eggs because I found that they would give me severe stomach aches. But I can eat eggs baked into a cake etc. I also have a sulfa sensitivity and any drugs containing sulfa will give me a severe headache. These things are very confusing. My sons Dr. told me it is the way you cook it. Also there is a good sight for food intolerances. Although she specializes in kids it can be helpful for all.