When you eat, your body uses this food to fuel the cells. The absorptive state of metabolism lasts for about four hours, during and after each meal. Throughout this state, digested food is converted into sugar or glucose. Insulin is a hormone that allows glucose to enter the cells and be used for energy. The liver will store glucose or turn any excess glucose into body fat for storage. The remaining glucose is stored in skeletal muscle as glycogen. During the postabsorptive state, the digestive tract is empty and energy comes from the breakdown of the body's reserves. Through a series of processes, glucose is ultimately released into the bloodstream by the liver in order to maintain normal blood glucose levels.
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