Myth: Water is the only fluid that truly hydrates your body.
According to the International Center for Sports Nutrition, juice, milk, soft drinks, coffee and other beverages count too. Research has shown that the dehydrating effect of caffeine-containing coffee and soda has been exaggerated. An average 12-ounce can of caffeine-containing soda results in the loss of just 1 ounce more fluid through urine than would normally occur. Aim for 8 to 12 glasses of fluid a day. Keep water as the number 1 pick.