Remember, the energy charge basically tells us the relative concentration of ATP. And if the energy charge is high, we're going to have a high concentration of ATP in our cell. Now, if we have plenty of ATP molecules, we're also going to have plenty of intermediate molecules that help us produce those ATPs. So things like NADH and acetylco enzyme A will also have a high concentration in the cell under resting conditions. And because under resting conditions we don't actually want to produce any more ATP molecules from the glucose, we want to conserve that glucose. What our cells will do is they will actually inactivate Pyruvate decarboxylation.