Water intake from all beverages, with the exception of alcoholic beverages, was greater in the first 6h period (morning period) and decreased throughout the day.

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Fluctuation of Water Intake and of Hydration Indices during the Day in a Sample of Healthy Greek Adults.

Received: 31 January 2019 Revised: 21 March 2019 Accepted: 2 April 2019 Published: 6 April 2019.

Measurement of hydration indices in spot or in 24 h urine samples may mask mild dehydration in specific periods of the day.

Healthy subjects ( n 164; 74 females; age 38 12 years) living in Athens, Greece were enrolled in the study.

Subjects recorded their solid food and drink intakes and recorded and collected all urinations for three consecutive days.

Water intake was analyzed in 24 h and 6 h periods from wake-up time and scored for variety.

Urine hydration indices (osmolality, volume, color, specific gravity) were analyzed in 24 h samples, in morning urine samples and in samples collected in 6 h periods from wake-up time.

Fluctuations during the day were significant for the intake of drinking water, hot beverages, milk, fruit and vegetable juices, and alcoholic drinks and for urine osmolality, volume, color, and specific gravity.

The urine volume of the first 6 h period after wake-up time (557 231 mLday) reflects by 76 the 24 h urine collection (1331 144 mLday).

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