The human body is 60 percent water, and maintaining a healthy level of water is important in preserving life and maintaining homeostasis. Hydration is important for the transport of nutrients, the moisture of tissues, and the removal of waste products. Essentially, water regulates most activities in the body, including the activity in lymph, blood, glands, tissues, and cells. Water is lost through perspiration, respiration, and elimination.
The amount of water consumption required per day depends on a variety of individual circumstances, including a person’s age,
activity level, geographic location, and general health. The Institute of
Medicine recommends that men consume about 3 liters (13 cups) of water per day and women consume 2.2 liters (9 cups). Although the rule of thumb of drinking eight 8-ounce glasses of water per day is still valid, water needs really do depend on the individual situation.