There is a another role of stomach and brain stomach digest food and brain is used for thinking.
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when food pipe gets connected to brain which is more important than stomach then food particles may enter brain and this will disturb it's function. We knew that in body each each function is under some particular organ or part. Here digesting food is done by stomach and so that particular function is to be done by that itself. For an example think of a condition in which we take in food through noseĀ  or ears instead of mouth....Here also condition is same