Water is an important constituent of diet. 75% of an infant body and 60% of an adult body is nothing but water. Various functions of water are:

  • essential for the transport and digestion of food material.
  • excretes wastes.
  • maintains the body temperature.
  • acts as solvent in various reactions in the body.

Sources of Water

Water is replenished by:

  • drinking of plain water or of tea, coffee, milk and fruit juices.
  • eating fruits, vegetables and fish.
  • some amount of water comes as a by-product of oxidation of glucose in the body.


Roughage is the fibre present in some food items like fruits and vegetables. Though roughage is not a food, it forms an important part of our diet. Roughage consists mainly of cellulose.


  • It helps in bowel movement.
  • It cleans our digestive tracts and protects the body from digestive ailments.
  • It prevents constipation.
  • It helps in retaining water in the body.
  • It helps in maintaining optimum levels of blood sugar and cholesterol.