Water is considered as the most important nutrient for the body. It forms the greatest component of the human body, making up 50% to 60% of body weight. Lean muscle tissue contains about 73% water. Fat tissue is about 20% water. Thus as fat content increases in the body, total body water content declines towards 50%. Water – the most versatile medium for all kinds of chemical reactions constitutes the major portion of our bodies. Without water, the life processes would cease in a matter of days.
The water content of soft tissues ranges from 70 to 80 per cent while that of bone about 20 per cent.