Even water can be dangerous if you drink massive amounts:
If a compound is made by Nature, we assume it must be good for us. If it’s artificial or it has a long unpronounceable name, on the other hand, we assume it must be toxic, and it’s only a matter of time until scientists figure that out. Alas, the truth is more complicated than popular culture would have you believe. Nature makes poisons more vicious than any chemists can invent. And nearly anything can be toxic if you consume too much.
(Hat tip: The Browser)
The Dish 