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I won't let one kind of food touch any other food on the plate

I used to have that fixation, but I got over it around age 8 when I discovered I liked mixtures like chili and beef stew. I think it was one of those mistaken generalizations that kids make as they are trying to figure out how the world works: Getting dirt on your apple makes it "dirty" (and thus inedible), so in general anything touching a food item makes it dirty [and here is the mistake] including other food items. LOL