Water is the most significant single component of the body. It accounts for approximately 75% to 85% of total body weight at birth. This proportion decreases with age and adiposity. Water accounts for 60% to 70% of total body weight in the lean adult but only 45% to 55% in the obese adult. 

We all celebrate World Health Day on April 7 annually to mark the founding of the World Health Organization (WHO). The day was observed primarily on April 7, 1950.