Water is clearly the most important nutrient and the most abundant substance in the human body. Water comprises about three quarters of the human mass and is a major component in every cell. In addition water is important to human health for many reasons including but not limited to the following:
• Water is needed to separate (by a process called hydrolysis) a phosphate group from adenosine triphosphate (ATP) or guanosine triphosphate (GTP) to get energy as illustrated by the following equation