See? We'd also die in minutes with too much oxygen, too much sugar, or too much salt, but we need those things to live too. Lack of or too little of (insert traditional chemical name) would kill us: in about three minutes for oxygen. in about three days for water. in about three weeks for sugar or salt. You have to be careful not to have too much of them, too, but that's true with anything, and we can't live without enough of those four things.
