If there is a glucose shortage, how does the body produce energy?

The body will use fat as a source of energy when glucose levels are low.

It takes energy from your other organs or body part which interacts with producing energy

Explanation:

in your blood to cells that need it; it gives your body energy. Your body needs enough insulin to keep glucose levels from dropping too low. However, in order to use the glucose, your body needs insulin. This is a hormone produced by the pancreas