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Medical visualization showing how the body accesses stored glucose for energy when there is a lack of glucose in the bloodstream from lack of food. Between meals, blood sugar levels drop. Your body's primary goal is to maintain glucose levels within a normal range. The brain requires a constant supply of glucose in order to function. When you are not eating, there is little need for insulin in the blood to promote the movement of glucose into cells because the glucose isn't there. This is when your cells need glucose from other sources. In the absence of insulin, your body uses stored glucose. Glucagon (which is released when the body is low on glucose) is a hormone that promotes the utilization of glucose that is stored in the liver.
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