In either the human body or a car, low fluid level—even of fluids needed for a relatively minor subsystem, such as the radiator—can accelerate aging and cause the whole system to break down. Undernourishment in humans is like low levels of motor oils or other fluids in cars. Another comparison: the car—like the human body—needs both high-quality oils and fuel for its brakes and engine to operate properly. If these products are of low quality or the wrong kind—similar to saturated fats in our diet—the engine and other parts of the car can be damaged and deteriorate faster. Eventually the damage
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