We've all heard about how important it is to drink enough water, but few people understand why. How often do we really count the glasses of water we consume each day, and even if we did – how we know eight glasses is enough? According to the Mayo Clinic, water needs vary by individual and the question of how much to drink is not easily answered. Several studies have produced recommendations over the years, but how much water you drink will depend on other factors such as your activity level and where you live.
If you think the subject of drinking water unimportant, major U.S. healthcare organizations would disagree. On the "Nutrition and Eating" section of the Mayo Clinic's website is a section devoted exclusively to water. While even the Mayo Clinic staff says there is "no single formula" for determining your body's ideal fluid intake, it is possible to make an estimate.