Much more than thirst By Dennis King, Chairman, National Speed Coaches Association Seldom is water thought of as food. While it has no caloric value and does not provide any of the other nutrients, water is second in importance only to oxygen in maintaining life. While we can survive for weeks or even months, without food, we cannot tolerate water deprivation for more than a few days.
Water is necessary for digestion, absorption, circulation and excretion.
With respect to exercise, water plays two critical roles. First, it is important in maintaining electrolyte balance in the body. Second, it is a transporter of nutrients and byproducts to and from the cells, via the circulatory system. Water intake is controlled largely by thirst sensations generated by a complex series of events in the body. However, these mechanisms do not always keep pace with the body's need for water.