http://en.wikipedia.org/wiki/Water_intoxication
Water intoxication (also known as hyper-hydration or water poisoning) is a potentially fatal disturbance in brain functions that results when the normal balance of electrolytes in the body is pushed outside of safe limits by over-consumption of water.[1] Normal, healthy (physically, nutritionally and mentally) individuals have little reason to worry about accidentally consuming too much water. Nearly all deaths related to water intoxication in normal individuals have resulted either from water drinking contests, in which individuals attempt to consume high amounts of water, or long bouts of intensive exercise during which electrolytes are not properly replenished, yet excessive amounts of fluid are still consumed.[2]
Water can be considered a poison when super-concentrated just like any other substance. The recommendation from the medical field is to drink about 1.5-3 litres per day depending upon body mass. Water intoxication would only occur at levels far higher than that. Most people drink too little water. Doctors who have analyzed recommendations based upon water intoxication have noted that water is so important to health that if people reduce their intake of water due to fear of water intoxication it could result indirectly in far more deaths than water intoxication itself.
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