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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.
Topics | Diet & Nutrition | Nutrition | Carbohydrates | Why is glucose an important energy source? While fat is the preferred energy source in most tissues, the brain is critically dependent upon glucose as its energy source. If blood glucose levels were to drop below a certain minimum value, death would occur in a few seconds.