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Water is the largest component of the human body, comprising 75% of body weight in infants and 50% to 60% of body weight in children, adolescents, and adults.1  It helps regulate body temperature, protect vital organs, support nutrient absorption, serve as a medium for biochemical reactions, and maintain blood volume. Food and drink intake; sweat, urine, feces, and vomitus excretion; metabolism; breathing; and exercise all influence body water volume.

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