Water Intoxication and the Deadly Slake

We have been taught to drink a lot of water. Some people drink 64 fl oz. – or two liters — of water a day. Are eight 8 oz. glasses of water too much or just enough?
Our bodies need water and salt. If we drink too much water too rapidly we risk diluting our salt content and putting ourselves in a state of hyponatraemia — a loss of enough salt in the blood — and that can lead to heart trouble and brain malfunction. 

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