One job of our liver cells, and to much smaller extent our kidney cells, is to actually regulate and maintain the proper glucose levels inside our blood. Now, why is that actually important? Why is it important to maintain the proper glucose levels? Well, because the cells of our body actually use that glucose to form the energy ATP molecules. And the ATP molecules are then used to power many different types processes such as, for instance, gluconeogenesis. So remember, gluconeogenesis actually uses up on that amount of ATP and GTP molecules.