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Diabetes Mellitus is a 500 year old term that describes the sweet-smelling urine of people whose bodies have stopped being able to regulate blood sugar properly. We now know that it refers to a family of different (and largely unrelated) diseases that all have the same symptoms before doctors can determine what has caused them. People – even doctors – still have trouble understanding the differences between these diseases, so I tried to come up with a simple and (hopefully) humerous analogy by thinking of each disease as a problem with your car.