The muscles, not surprisingly, use plenty of glucose, as do the heart and liver. The immune system uses large quantities, but only sporadically. When you’re relatively healthy, your immune system may use only a relatively small amount of glucose. But when your body is fighting off a cold, it may consume gobs of it. That’s why sick people sleep so much: The body uses all the energy it can to fight the disease, and it can’t spare much for exercising, making love, or arguing. It can’t even do much thinking, a process that requires plentiful glucose in the bloodstream. The glucose itself doesn’t
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