Our Body needs Water

60% of our body weight is represented by water


60% of our body weight is represented by water. This percentage is higher in childhood and decreases with age and with the increase in fat deposits. Water is the fundamental solvent for all products of digestion, regulates cell volume, body temperature, is essential to eliminate all metabolic waste from the body and allows the transport of nutrients.

Food sources

To the water that we introduce with food and drink we need to add about 350 ml products every day from cellular respiration.


It is not possible to establish a daily requirement for water as the need varies with climate, age, diet and activity. A daily intake of water between 1 ml / Kcal and 1.5 ml / Kcal of energy spent in the adult allows to balance losses and make the solute load tolerable for the kidneys. Especially in the child, it is necessary to check that there is a contribution of 1.5 ml / kcal of energy spent, the greater the quantity of water per unit of weight and the lower the renal capacity. Even pregnancy and breastfeeding lead to a greater need for water.


Water is essential to eliminate all metabolic waste from the body and allows the transport of nutrients


Water losses occur physiologically with respiration, sweating, urination; pathologically with vomiting and diarrhea. Dehydration can cause imbalances ranging from cramps to hallucinations and loss of consciousness. Water reductions for 20% of body weight are incompatible with life; on the contrary, an excess of body water content can give neurological symptoms.

How water is distributed in the body

Total body water is located mainly inside the cells and forms the intracellular fluid; the part that constitutes the extracellular fluid includes the interstitial fluid, the plasma, the lymph and the transcellular fluid. Aging causes a decrease in total body water, while in some diseases (cirrhosis of the liver, heart failure, nephrotic syndrome) total body water and the relationship between the intra and extracellular fluid changes. The balance between the volume of the incoming and the outgoing water is regulated by the center of the hypothalamus silica through the antidiuretic hormone which acts on the renal absorption.

4 thoughts on “Our Body needs Water

  1. Laurentina says:

    Most of the organs and tissues contain more than 70% water: blood and kidneys consist of 83% water, and muscles 76% water. … Two third of the body water is intracellular. The extracellular fluid consists of plasma and interstitial fluids. Ingested water is absorbed mainly in the small intestine.

    • Chattanooga says:

      The human body needs food and water to survive. A human can go for more than three weeks without food — Mahatma Gandhi survived 21 days of complete starvation — but water is a different story. At least 60% of the adult body is made of it and every living cell in the body needs it to keep functioning

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