Drinking plenty of water is important all year, but especially during the summer. Muscle tissue is 70 to 75 percent water. Fat is 10 to 15 percent water. Body fluids help to lubricate the joints and cushion organs. Blood transports nutrients and oxygen to muscles.
Blood carries carbon dioxide, lactic acid, and other waste products away.
Water helps excrete waste products from your body. Water transports heat from the muscles to the skin. Sweat cools the body. Water helps to moisten and warm cold air before it hits the lungs. Body fluids help to maintain skin temperature in cold weather.