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A typical pattern of daily water exchange was determined in 10 medical students during three different seasons: summer, autumn and winter. The daily water intake was averaged to 3,810 ml of which 1,256 ml was from liquids, 2,055 ml from the water contained in food and 500 ml from the water of oxidation. On the other hand, the daily water output was 1,844 ml by urinary loss, 144 ml by fecal loss and 1,819 ml by evaporative loss. The above quantitative pattern of daily water exchange in the Korean remained unchanged throughout the year. The daily urinary output of NaCl and urea-nitrogen was in the order of 20 gm and 10 gm, respectively. Furthermore, the magnitude of daily water intake was well correlated to the daily urinary output of NaCl but little correlated to that of urea-nitrogen. A comparison of these data with the corresponding figures obtained from the occidental indicates that the daily water intake and the daily urinary output of NaCl were significant1y greater in the Korean than those in the occidental. On the basis of these results, the greater water intake in the Korean was attributed to their high salt intake.
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