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Best Answer: Well - the kidney is the organ that regulates the amount of water *leaving* your body. It is controlled by hormones from other parts of your body: the pituitary gland below the brain, the adrenal glands above the kidneys, the liver. Intake of water is done by drinking, and most of the water is absorbed in your large intestine. The state of being thirsty is hormonally controlled from the hypothalamus.
Any healthy inactive adult residing in a temperate climate should maintain an intake of 1.5 liter of water per day. The consumption of water enables the body to remain hydrated and balance water losses. Water is a major constituent of a human body and vital organs. Water provides many vital functions in our body, namely in cell life, chemical and metabolic reactions, transport of nutrients, body temperature regulation and elimination of waste. Water is our bodyâs most essential and important nutrient. It is involved in every bodily function and constitute for 70-75% of human total body weight. The lack of water in the body in sufficient amount can make it stop working properly.