Water in your body

   
Water-in-your-body

Water : Human body's major component

On average, the body of an adult human being contains 60% water. Most of the water in the human body is contained inside our cells.

Water-in-your-body-1

In fact, our billions of cells must have water to live.

The total amount of water in our body is found in three main locations: within our cells (two-thirds of the water), in the space between our cells and in our blood (one-third of the water). For example, a 70-kg man is made up of about 42L of total water.

  • 28 litres is intracellular water
  • 14L is found in extracellular fluid of which
  • 3L is blood plasma,
  • 1L is the transcellular fluid (cerebrospinal fluid, ocular, pleural, peritoneal and synovial fluids)
  • 10L is the interstitial fluid (including lymph), which is an aqueous medium surrounding cells. (1)

Actually, the amount of water a body contains varies according to certain contexts : The body of a newborn is composed of more water (75%) than that of an elderly person (50%). Also, the more muscular a body is, the more water it contains. Conversely, the more fat in the body, the less water the body contains – as body fat has little water.

Also, all our vital organs contain different amounts of water: the brain, the lungs, the heart, the liver and the kidneys contain a large quantity of water – between 65 to 85% depending on the organ (2), while bones contain less water (but still 31%!).

For all those reasons, water is life.

Sources:

  • (1) Wang et al. (1996). Am J Clin Nut 69 : 833-841
  • (2) Mitchell et al. The Journal of Biological Chemistry, 1945: 625-637.

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