Hydration Status, Association of Body Composition and Bone Mass in Children and Adolescents

The objective of this study was 1) to evaluate which foods or beverages are significantly associated with an objective marker of hydration status (USG), to examine the association between hydration status or total fluid intake with body fat % and fat-free mass (FFM) (2) and bone mineral density (BMD) and bone mineral content (BMC) (3) in children (10-13y) and adolescents (18-20y). Intake was assessed from three 24-hour dietary recalls and analyzed using the Nutrition Data System for Research (NDSR). Hydration status was objectively measured using USG via 24-hour urine collection and body composition and all bone parameters were measured using the Dual-X-Ray Absorptiometry Scan (DEXA). Descriptive statistics, independent t-test, Shapiro-wilk test, and multiple linear and logistic regressions were conducted to analyze the data. A total of 52 children (n=18) and adolescents (n=34) were recruited (50% females). Mean age was 17.0 ± 3.72 years, most participants were white (57.7%), and reported being Hispanic (73.1%). Intake of fruit juice, water, all beverages, and total water intake from all sources was significantly (p Our data suggested that 1) water, fruit juice, and total water intake from all sources is significantly associated with hydration status; 2) total water intake from all sources is associated with FFM and lean mass; and 3) total water intake from all sources is associated with BMC. Future research should include a larger and more generalizable sample. The study was approved by the Institutional Review Board of Florida International University (IRB-22-0045)