Determinant of factors associated with water requirement measured using the doubly labelled water method among older Japanese adults.

Water is an essential nutrient for all organisms and is important for maintaining life and health. We aimed to develop a biomarker-calibrated equation for predicting water turnover (WT) and pre-formed water (PW) using the doubly labelled water (DLW) method. Cross-sectional study. General older population from the Kyoto-Kameoka Study, Japan. The 141 participants aged ≥ 65 years were divided into a model developing ( The median WT and PW for 141 participants were 2·81 and 2·28 l/d, respectively. In the multivariate model, WT ( Our results showed factors associated with water requirement and indicated a methodological approach of calibrating the self-reported dietary intake data using biomarkers of water consumption.