Arsenic in water? We’re adapting
Over 400 years ago, alchemist and physician Paracelsus said: “All substances are poisons; there is none that is not a poison. The right dose differentiates a poison from a remedy.”...Some years ago, a death occurred due to the overconsumption of carrots. People have died from drinking too much water (water intoxication). Too much oxygen (vital for life) results in cell damage and can lead to death (oxygen toxicity). Likewise, even for extremely toxic substances such as snake venom, there is a dose below which there is no detectable toxic effect. [source]