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Nutrients and its importance :: Macronutrients - Water

Water is very essential nutrient without which human life cannot survive. More than 70% of the human body is made up of water. Loss of water through sweat, excretion, etc., needs to be replaced with what we eat and more importantly, drink.
  • Water is the medium of all body fluids including digestive juices, lymph, blood, urine and perspiration.
  • Water is a solvent for the products of digestion, holding them in solution and permitting them to pass through the absorbing walls of the intestinal tract into the blood stream.
  • It transports all nutrients to and from different parts of our body.
  • It aids the processes of chewing, absorbing, digesting, etc.,
  • It acts as a lubricant. Present in and around tissues, it defends our bodies against shock. The brain, eyes and spinal cord are among the body’s sensitive organs cushioned by a protective water layer.
  • It regulates body temperature by taking up the heat produced in cellular reactions and distributing it throughout the body.
  • It helps purify the system by stimulating the elimination of waste substance and toxins.
Water to meet the body’s needs is supplies by
  • The ingestion of water and beverages
  • The performed water in foods
  • The water resulting from the oxidation of food stuffs.
Foods Percentage of water
Milk 87
Eggs 75
Meat 40
Fruits, vegetables        70-95
Cereals, ready-to-eat 1-5
Cereals, cooked 80-88
Breads 35

Daily losses of water

The daily losses of water include

Daily losses of water ml
Faeces 100-200
Urine   1000-1500
Lungs  250-400
Insensible perspiration       400-600
Visible perspiration   None to 10,000


 It is recommended that at least 8-10 glasses of water every day. 8-10 glasses of water a day can significantly ease joint and back pain.


Robinson,C.N and Lawler, M.R 16 Edition. Normal and Therapeutic Nutrition. Oxford and IBH Publishing Co, Delhi.

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