Diverticulitis

A friend of mine at work saw me order my salad without tomatoes the other day and asked if I had this disease: Diverticulitis. Well, I guess it's not a food allergy but a condition where little pockets are formed in the intestines and things can get caught in them and become inflamed. Mainly small things like seeds. But, its serious enough that my friend can't eat any foods that have seeds. No tomatoes, cucumbers, grapes, strawberries, and much much more. I thought my tomato allergy was bad. Makes me wonder if maybe some food allergies are the result of some kind of disease or inability to digest something. Is that what food allergies really are? Interesting and worth further research.