system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is cyanide such a deadly poison?
gpt
Poisons are toxic because they interfere with the body's biochemistry.

Cyanide's toxicity is because it interferes with the way energy is used and generated within the cell. It binds permanently to one of the cells' most important enzymes, preventing it from doing its job in using sugars in the cells. Without energy, the cells cannot do their jobs, and will eventually die.