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Oh good heavens. I think I may have an intolerance to oyster mushrooms. Apparently they're high in arabitol, which can irritate the gut. I had a rather unhappy afternoon after lunching (otherwise excellent) Vietnamese vegetarian food, and I was also struck down after Chicago TARDIS last year after devouring an omelette containing the things. I may have to add the little beggars to the list of substances which really ought not to pass my lips, including dried apples and textured soy protein.