As we age, and as the daily context of our lives changes, our water needs change as well.
The adult body is around two-thirds water, but the amount of water within different organs vary.
- The brain and heart are 73% water
- The lungs are 83% water
- The skin is 64%
- The bones are about 31% water*
Water serves essential functions in the body, including regulating the internal temperature, acting as a building material or lubricating joints.
*Mitchell et al. The chemical composition of the adult human body and its bearing on the biochemistry of growth. The Journal of Biological Chemistry 1945: 625-637