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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.
Glucose is the Primary Source of Energy for Cells. 1  Glucose is the human body's key source of energy as it provides energy to all the cells in our body. Glucose also is critical in the production of proteins, lipid metabolism and is a precursor for vitamin C production. Glucose is the sole source of fuel to create energy for all brain and red blood cells. The availability of glucose influences many psychological processes. When glucose levels are low, psychological processes requiring mental effort l(self-control, critical thinking and decision-making) become impaired.