Water consumption by man in a warm environment: a statistical analysis.

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Abstract
Twenty-two metabolic variables were examined using stepwise linear regression analysis for their possible relationship to voluntary water consumption in 87 young men. Six variables: 1) mean daily urinary vol, 2) serum osmolarity, 3) lying pulse rate, 4) mean daily urinary Cl, 5) mean daily urinary K, and 6) rate of sweating accounted for 62% of the variation in water intake. The addition of the remaining 16 variables accounted for only 71% of the variation. An equation was constructed that estimated water intake from these 6 variables. The anions, particularly Cl, might be of greater importance in influencing drinking than has been previously realized. The data suggest that some combination of body osmolarity and body fluid volume is associated with voluntary water intake in man.

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