There is no reservoir for water in the human body, but it is distributed among the different organs to a greater or lesser extent. Even tooth enamel – the most mineralised tissue in the human body – contains 2% of water. Nails, the composition of which is similar to that of animals’ hooves or horns have 12% humidity, and moisture in your hair can reach 30%.
To preserve health it is essential to maintain chemical balances that support the biochemical relationships of the various cells and body organs – what is known as homeostasis – and adequate hydration is the basic foundation for achieving this balance.
The water content of the body varies between men and women, as in men the relatively greater musculature results in a higher water content. The body of a woman with identical weight contains about 10% less water.