This is especially important for moving food through the digestive tract. Persons who experience reduced salivary output soon will realize that foods taste differently and are harder to swallow. As a lubricant, water also is helpful for smooth movement of bone joints. Water participates in the body's biochemical reactions. The digestion of protein and carbohydrates to usable and absorbable forms depends on water as part of the chemical reaction.
Water regulates body temperature.
Our health and well-being are dependent on keeping body temperature within a very narrow range. The human body, which is made of 60-75 percent water, serves this function quite well. Water itself changes temperature slowly and is able to help regulate body temperature by serving as a good heat storage material. Evaporation of water from body surfaces also helps cool the body. Sweat loss that is barely noticeable occurs every day and night.