Y Tani1, K Asakura2, S Sasaki1, N Hirota3, A Notsu4, H Todoriki5, A Miura6, M Fukui7, C Date8. 1. Department of Social and Preventive Epidemiology, School of Public Health, the University of Tokyo, Tokyo, Japan. 2. 1] Department of Social and Preventive Epidemiology, School of Public Health, the University of Tokyo, Tokyo, Japan [2] Interfaculty Initiative in Information Studies, Graduate School of Interdisciplinary Information Studies, The University of Tokyo, Tokyo, Japan. 3. Graduate School of Health Science, Matsumoto University, Matsumoto, Nagano, Japan. 4. Department of Food Science and Nutrition, Tottori College, Tottori, Japan. 5. Department of Public Health and Hygiene, School of Medicine, University of the Ryukyus, Nakagami-gun, Okinawa, Japan. 6. Department of Health and Nutritional Sciences, Faculty of Health Promotional Sciences, Tokoha University, Hamamatsu, Shizuoka, Japan. 7. Department of Statistics, Osaka City University Medical School, Osaka, Japan. 8. Department of Food Science and Nutrition, School of Human Science and Environment, University of Hyogo, Himeji, Hyogo, Japan.
Abstract
BACKGROUND/ OBJECTIVES: To examine the influence of season and climate (air temperature and humidity) on water intake by the food group in a sample of free-living Japanese adults. SUBJECTS/ METHODS: Four-nonconsecutive-day, semi-weighed dietary records were collected from each of the four seasons in a single 12-month period (16 days in total). The influence of season and climate on individual water intake by the food group was analyzed using a mixed linear model. Participants were 242 healthy adults (121 women aged 30-69 years and 121 men aged 30-76 years) from four areas in Japan. RESULTS: For women and men together, the mean total water intake was 2230 g/day (highest in summer: 2331 g/day; lowest in winter: 2134 g/day). Fifty-one percent of water was derived from foods and the rest from beverages. In a mixed linear model adjusted for sex, age and body mass index, intake of water from foods decreased by 3.1 g/day and that from beverages increased by 8.4 g/day, with an increase in the mean outdoor air temperature on the survey day of 1 °C (both P < 0.0001). The influence of humidity was nonsignificant. CONCLUSIONS: In contrast to previous findings in Western countries, half of water intake in Japanese adults was derived from foods. Water intake from beverages was positively associated with air temperature, whereas that from foods was inversely associated with air temperature.
BACKGROUND/ OBJECTIVES: To examine the influence of season and climate (air temperature and humidity) on water intake by the food group in a sample of free-living Japanese adults. SUBJECTS/ METHODS: Four-nonconsecutive-day, semi-weighed dietary records were collected from each of the four seasons in a single 12-month period (16 days in total). The influence of season and climate on individual water intake by the food group was analyzed using a mixed linear model. Participants were 242 healthy adults (121 women aged 30-69 years and 121 men aged 30-76 years) from four areas in Japan. RESULTS: For women and men together, the mean total water intake was 2230 g/day (highest in summer: 2331 g/day; lowest in winter: 2134 g/day). Fifty-one percent of water was derived from foods and the rest from beverages. In a mixed linear model adjusted for sex, age and body mass index, intake of water from foods decreased by 3.1 g/day and that from beverages increased by 8.4 g/day, with an increase in the mean outdoor air temperature on the survey day of 1 °C (both P < 0.0001). The influence of humidity was nonsignificant. CONCLUSIONS: In contrast to previous findings in Western countries, half of water intake in Japanese adults was derived from foods. Water intake from beverages was positively associated with air temperature, whereas that from foods was inversely associated with air temperature.
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