I've been thinking thoughts +suspiciously similar to this recently, after staying with friends and having two fairly major upsets due to my physical intolerances. For me it's caffiene, chocolate, high fat dairy (as in, all the fun stuff) and sugar. I have hypoglycaemia (think reverse diabetes) and mistakenly ate far too much sugar when we went out for dessert one night: I then had to deal with jitters and shakes and nausea as well as an upset stomach. I recall thinking that 'normal' people don't have to watch their food intake so carefully, but I think actually it's becoming more common. I read an article on the plane home that said nut allergies are increasing (perhaps the diagnosis is more accurate?) and posited that it is because we no longer have seasonal diets, but eat pretty much the same thing each week/month. Although I would have thought that with wheat products (which were made year round and nut products (which were eaten because they kept year round) this would always have been the case.

You have my sympathy and my empathy.