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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.
Energy Production. The primary role of carbohydrates is to supply energy to all cells in the body. Many cells prefer glucose as a source of energy versus other compounds like fatty acids.Some cells, such as red blood cells, are only able to produce cellular energy from glucose.nergy Production. The primary role of carbohydrates is to supply energy to all cells in the body. Many cells prefer glucose as a source of energy versus other compounds like fatty acids.