Firstly, at the current stage of knowledge, there are two possible groups of people who experience symptoms when eating gluten which do not occur on a gluten free diet: one is celiacs, as you say and the other is what are generally called non-celiac gluten intolerants (though all of them may, in fact be part of a broad spectrum of disease which may in the future be labeled as celiac disease) – most of whom do not present with the characteristic intestinal lesions used as a diagnostic for celiac disease.

You referred to food allergies in your post. This is an old term now no longer used in favor of “food intolerances”, because the term allergy implies direct involvement by the immune system, and most food intolerances do not trigger the immune system directly, although incorrect digestion may produce a substance which does – however, simple allergy tests will not pick these up.

The definition of schizophrenia given by you is incorrect, and seems to be very similar to the common view in the 1950s. Schizophrenia is not split personality, and no modern psychiatrist would define it as such. It is a disorder in which the sufferer experiences hallucinations – which can be auditory, visual, tactile or any combination of these. Schizophrenics may also at some stages experience paranoia and exhibit certain characteristic behaviors which those of us who have known them over a number of years will recognize immediately. As for the paranoia, it’s my belief that anyone afflicted with constant hostile voices and visions (for some reason they do always seem to be hostile – perhaps people with friendly voices don’t regard it as a problem) would become paranoid!