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1 After you eat, carbohydrates break down into sugar and enter the bloodstream in the form of glucose, a sugar that serves as a primary source of energy. 2  Normally, the pancreas responds by producing insulin, which allows sugar to enter the tissues.
What it is: Glucose is a monosaccharide. It is an important nutrient, and it is the major energy source for brain cells. The human body can store a certain amount of glucose as glycogen, and of course, excess glucose can be converted to fat.