480 Bananas
Let us ignore, for now, the logistical difficulties of fitting 480 bananas in our stomach, and talk about potassium. A typical banana contains about 450 milligrams of potassium, making it an excellent source of the electrolyte. Potassium ions flow through our bodies, maintaining the balance of fluid inside and playing a role in muscle contractions and nerve impulses. Cells in virtually every tissue in the body have potassium channels.
It would be virtually impossible to eat a median lethal dose of potassium (about 1.4 pounds), but the element is a lot more deadly injected directly into the bloodstream, when a massive and sudden influx overwhelms the body. We know this all too well because in lethal injections, potassium chloride is the final chemical that stops the heart from beating.