Answer:
If, by some strange twist of fate, the human body were to completely run out of essential energy, it would be a dire situation, and death could come knocking within just a few minutes to a couple of hours. Our bodies rely heavily on energy sources like ATP to keep our cells functioning, and without them, everything starts shutting down pretty fast. Fortunately, in real life, this is incredibly unlikely because our bodies are excellent at maintaining energy levels to keep us alive and kicking.