Final answer:
The liver breaks down glycogen into glucose in the postabsorptive state, which is necessary to maintain blood glucose levels when food is not being consumed.
Step-by-step explanation:
The liver would start to break down glycogen in the postabsorptive state (fasting state). This state occurs when the food has been digested, absorbed, and adequately stored. During the postabsorptive state, the body's glycogen stores are utilized to maintain blood glucose levels. As blood glucose levels begin to drop, insulin levels decrease, and the pancreas releases the hormone glucagon. Glucagon signals the liver to stop glycogen synthesis and to start breaking down stored glycogen into glucose, which is then released into the bloodstream to be used as fuel by cells throughout the body.