Pontzer H, Brown MH, Wood BM, Raichlen DA, Mabulla AZP, Harris JA, et al. Evolution of water conservation in humans. Curr Biol. 2021;31:1804–10.e5. https://doi.org/10.1016/j.cub.2021.02.045

Article CAS PubMed Google Scholar

Sawka MN, Cheuvront SN, Carter R 3. Human water requirements. Nutr Rev. 2005;63:S30–9. https://doi.org/10.1111/j.1753-4887.2005.tb00152.x

Article PubMed Google Scholar

Yamada Y, Zhang X, Henderson MET, Sagayama H, Pontzer H, Watanabe D, et al. Variations in human water turnover associated with environmental and lifestyle factors. Science. 2022;378:909–15. https://doi.org/10.1126/science.abm8668

Article CAS PubMed PubMed Central Google Scholar

Swanson ZS, Pontzer H. Water turnover in human populations: environmental and lifestyle effects. Am J Hum Biol. 2020;32:e23365. https://doi.org/10.1002/ajhb.23365

Article PubMed Google Scholar

Sagayama H, Kondo E, Shiose K, Yamada Y, Motonaga K, Ouchi S, et al. Assessment of energy requirements and water expenditure in Japanese collegiate wrestlers using the doubly labeled water method. J Nutr Sci Vitaminol. 2017;63:141–7. https://doi.org/10.3177/jnsv.63.141

Article CAS PubMed Google Scholar

Raman A, Schoeller DA, Subar AF, Troiano RP, Schatzkin A, Harris T, et al. Water turnover in 458 American adults aged 40-79 years. Am J Physiol Renal Physiol. 2004;286:F394–401. https://doi.org/10.1152/ajprenal.00295.2003

Article CAS PubMed Google Scholar

Watanabe D, Inoue Y, Miyachi M. Distribution of water turnover by sex and age estimated by the prediction equation in Japanese adolescents and adults: the 2016 National Health and Nutrition Survey, Japan. Nutr J. 2023;22:64 https://doi.org/10.1186/s12937-023-00896-z

Article CAS PubMed PubMed Central Google Scholar

Fjeld CR, Brown KH, Schoeller DA. Validation of the deuterium oxide method for measuring average daily milk intake in infants. Am J Clin Nutr. 1988;48:671–9. https://doi.org/10.1093/ajcn/48.3.671

Article CAS PubMed Google Scholar

Butte NF, Wong WW, Patterson BW, Garza C, Klein PD. Breast milk intake measured by maternal administration of deuterium oxide: a comparison with the test weighing technique. Am J Clin Nutr. 1988;47:815–21. https://doi.org/10.1093/ajcn/47.5.815

Article CAS PubMed Google Scholar

Institute of Medicine Panel on Dietary Reference Intakes for Electrolytes and Water. Reference values ​​for intakes of water, potassium, sodium, chloride and sulphate. United Kingdom: National Academies Press; 2005.

Guy H. Domestic water quantity, service levels and health. Switzerland: World Health Organization; 2020.

Clark WF, Sontrop JM, Huang SH, Moist L, Bouby N, Bankir L. Hydration and progression of chronic kidney disease: a critical review of the evidence. Am J Nephrol. 2016;43:281–92. https://doi.org/10.1159/000445959

Article CAS PubMed Google Scholar

Perrier E, Rondeau P, Poupin M, Le Bellego L, Armstrong LE, Lang F, et al. Association between urinary fluid biomarkers and total fluid intake in healthy adults. Eur J Clin Nutr. 2013;67:939–43. https://doi.org/10.1038/ejcn.2013.93

Article CAS PubMed PubMed Central Google Scholar

Takae R, Hatamoto Y, Yasukata J, Kose Y, Komiyama T, Ikenaga M, et al. Relationship between lower extremity muscle performance and physical activity level and intensity in middle-aged and older adults: a dual-labeled water and accelerometer study. J Nutr Health Aging. 2020;24:1023–30. https://doi.org/10.1007/s12603-020-1449-6

Article CAS PubMed Google Scholar

Takae R, Hatamoto Y, Yasukata J, Kose Y, Komiyama T, Ikenaga M, et al. Physical activity and/or high protein intake maintains fat-free mass in older people with mild disability; the Fukuoka Island City Study: a cross-sectional study. Nutrients. 2019;11:2595 https://doi.org/10.3390/nu11112595

Article CAS PubMed PubMed Central Google Scholar

Speakman JR, Yamada Y, Sagayama H, Berman ESF, Ainslie PN, Andersen LF, et al. A standard calculation method for human studies using doubly labeled water. Cell Rep Med. 2021;2:100203 https://doi.org/10.1016/j.xcrm.2021.100203

Article CAS PubMed PubMed Central Google Scholar

Du Bois D, Du Bois EF. A formula for estimating approximate body surface area when height and weight are known. 1916. Nutrition. 1989;5:303–11.

PubMedGoogle Scholar

Murakami H, Kawakami R, Nakae S, Nakata Y, Ishikawa-Takata K, Tanaka S, et al. Accuracy of wearable devices for estimating total energy expenditure: comparison with metabolic chamber and doubly labeled water method. JAMA Intern Med. 2016;176:702–3. https://doi.org/10.1001/jamainternmed.2016.0152

Article PubMed Google Scholar

Tudor-Locke C, Camhi SM, Troiano RP. A catalogue of rules, variables, and definitions applied to acceleration data in the National Health and Nutrition Examination Survey, 2003-2006. Prev Chronic Dis. 2012;9:E113 https://doi.org/10.5888/pcd9.110332

Article PubMed PubMed Central Google Scholar

Watanabe D, Murakami H, Gando Y, Kawakami R, Tanisawa K, Ohno H, et al. Factors associated with changes in objectively measured physical activity among Japanese adults: A longitudinal and dynamic panel data analysis. PLoS One. 2023;18:e0280927 https://doi.org/10.1371/journal.pone.0280927

Article CAS PubMed PubMed Central Google Scholar

Ganpule AA, Tanaka S, Ishikawa-Takata K, Tabata I. Interindividual variability in metabolic rate during sleep in Japanese subjects. Eur J Clin Nutr. 2007;61:1256–61. https://doi.org/10.1038/sj.ejcn.1602645

Article CAS PubMed Google Scholar

Miyake R, Tanaka S, Ohkawara K, Ishikawa-Takata K, Hikihara Y, Taguri E, et al. Validity of prediction equations for basal metabolic rate in Japanese adults. J Nutr Sci Vitaminol (Tokyo). 2011;57:224–32. https://doi.org/10.3177/jnsv.57.224

Article CAS PubMed Google Scholar

Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron. 1976;16:31–41. https://doi.org/10.1159/000180580

Article CAS PubMed Google Scholar

Matsuo S, Imai E, Horio M, Yasuda Y, Tomita K, Nitta K, et al. Revised equations for estimating GFR from serum creatinine in Japan. Am J Kidney Dis. 2009;53:982–92. https://doi.org/10.1053/j.ajkd.2008.12.034

Article CAS PubMed Google Scholar

Japan Meteorological Agency. Weather information. Available at: www.jmagojp/jma/en/menuhtml. Accessed February 6, 2024.

Chang DC, Stinson EJ, Dodd KW, Bowles HR, Herrick KA, Schoeller DA, et al. Validation of total water intake using automated self-administered 24-hour recall, 4-day food records, and a food frequency questionnaire using doubly labeled water. J Nutr. 2023;153:3049–57. https://doi.org/10.1016/j.tjnut.2023.08.027

Article CAS PubMed Google Scholar

Watanabe D, Nanri H, Sagayama H, Yoshida T, Itoi A, Yamaguchi M, et al. Estimation of energy intake by a food frequency questionnaire: calibration and validation using the doubly labeled water method in elderly Japanese. Nutrients. 2019;11. https://doi.org/10.3390/nu11071546.

Murakami K, Livingstone MBE, Okubo H, Sasaki S. Prevalence and characteristics of misreporting of energy intake among Japanese adults: the 2012 National Health and Nutrition Survey. Asia Pac J Clin Nutr. 2018;27:441–50. https://doi.org/10.6133/apjcn.042017.11

Article PubMed Google Scholar

Fuller PJ, Young MJ. Mechanisms of mineralocorticoid action. Hypertension. 2005;46:1227–35. https://doi.org/10.1161/01.HYP.0000193502.77417.17

Article CAS PubMed Google Scholar

Shirreffs SM, Maughan RJ. Urine osmolality and conductivity as indices of hydration status of athletes in the heat. Med Sci Sports Exerc. 1998;30:1598–602. https://doi.org/10.1097/00005768-199811000-00007

Article CAS PubMed Google Scholar

Tani Y, Asakura K, Sasaki S, Hirota N, Notsu A, Todoriki H, et al. The influence of season and air temperature on water intake by food group in a sample of free-ranging Japanese adults. Eur J Clin Nutr. 2015;69:907–13. https://doi.org/10.1038/ejcn.2014.290

Article CAS PubMed Google Scholar

Phillips PA, Rolls BJ, Ledingham JG, Forsling ML, Morton JJ, Crowe MJ, et al. Reduced thirst after water deprivation in healthy older men. N Engl J Med. 1984;311:753–9. https://doi.org/10.1056/NEJM198409203111202

Article CAS PubMed Google Scholar

Rolls BJ, Phillips PA. Ageing and disturbances of thirst and fluid balance. Nutr Rev. 1990;48:137–44. https://doi.org/10.1111/j.1753-4887.1990.tb02915.x

Article CAS PubMed Google Scholar

Manz F, Wentz A. 24-h hydration status: parameters, epidemiology, and recommendations. Eur J Clin Nutr. 2003;57:S10–8. https://doi.org/10.1038/sj.ejcn.1601896.

Article PubMed Google Scholar

Watanabe D, Murakami H, Gando Y, Kawakami R, Tanisawa K, Ohno H, et al. Association between temporal changes in diet quality and concurrent changes in food intake, body mass index, and physical activity in Japanese adults: a longitudinal study. Front Nutr. 2022;9:753127 https://doi.org/10.3389/fnut.2022.753127

Article CAS PubMed PubMed Central Google Scholar

Watanabe D, Yoshida T, Watanabe Y, Yamada Y, Miyachi M, Kimura M. Dose-response relationships between objectively measured daily steps and mortality in frail and non-frail older adults. Med Sci Sports Exerc. 2023;55:1044–53. https://doi.org/10.1249/MSS.0000000000003133

Article PubMed PubMed Central Google Scholar

Armstrong LE, Johnson EC. Water intake, water balance, and the elusive daily water requirement. Nutrients. 2018;10. https://doi.org/10.3390/nu10121928.

Armstrong LE, Maresh CM, Castellani JW, Bergeron MF, Kenefick RW, LaGasse KE, et al. Urinary indices of hydration status. Int J Sport Nutr. 1994;4:265–79. https://doi.org/10.1123/ijsn.4.3.265

Article CAS PubMed Google Scholar