Our bodies reduce water during digestion, sweating and breathing activities. The amount of lost water should be replaced regularly. A healthy individual should consume an average of 2 liters of water a day. These rates may vary according to the climatic conditions, body weight, daily activities, if any, and health problems.
A man has 60% of his body weight and 50% of his body water. The ability of our organs and cells to sustain their function depends on the proportion of water we consume. Even a reduction in body fluid with a very small percentage can cause fatigue, distraction, and memory impairment. Decreasing body fluid is called 'dehydration'.