Most of this is ingested through food or drinks other than pure water. It is not clear how much water intake healthy people need, although most specialists agree that approximately 2 liters (6 to 7 glasses) of water per day are the minimum to maintain adequate hydration.

The medical literature favors a lower consumption, typically 1 liter of water for an average man, without including the additional requirements due to the loss of liquids by exercise or warm weather.