odorless tasteless transparent fluid, liquid oxide of oxygen (hydrogen oxide). Water regulates body temperature and keeps eyes, nose, mouth, brain, the air in lungs, all cells, organs and body tissues moist. It helps protect the spinal cord, helps organs to transport, metabolize and absorb nutrients, and acts as a lubricant and cushion for joints. Kidneys, liver and intestines use water to help flush out waste. Recommended dietary allowance of water (including moisture in foods) depends on age, gender and health conditions. It is about 1-1.5 milliliters per kcal of energy expended in activities, in addition to water depleted with heat exhaustion.
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