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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.
The role of glucose. Glucose â a sugar â is a main source of energy for the cells that make up muscles and other tissues. 1  Glucose comes from two major sources: food and your liver. 2  Sugar is absorbed into the bloodstream, where it enters cells with the help of insulin. 3  Your liver stores glucose as glycogen.