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There are no antibodies involved in a response to ingestion of MSG.  MSG contains what is called free glutamic acid and it is a neurotransmitter.  What this neurotransmitter does in the average human is stimulates the nerve cells in the mouth and in the brain.  It can also stimulate your sense of smell, your sense of taste and can even stimulate hunger. It is a drug like caffeine or alcohol and it will affect each of us in varying degrees.