(PO16-12-22) Association Between Hydration and Body-Fat Percentage in Children in Miami-Dade: Preliminary Data From the MetA-Bone Trial

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Presenting Author(s)

Priscilla K. Clayton, MS
– PhD Graduate Student, Florida International University, Miami, Florida, United States

Co-Author(s)

MT

Maria Angelica Trak-Fellermeier, PhD
– Research Coordinator, Florida International University, Miami, Florida, United States
Alison K. Macchi, PhD, RD
– Postdoctoral associate, Florida International University, Miami, Florida, United States
RG

Rodolfo Galván
– Florida International University
Cristina Palacios, PhD, MS
– Associate Professor, Department of Dietetics and Nutrition Robert Stempel College of Public Health & Social Work, Miami, Florida, United States

Disclosure(s):

Priscilla K. Clayton, MS: No relevant financial relationship(s) with ineligible companies to disclose.

Alison K. Macchi, PhD, RD: No relevant financial relationship(s) with ineligible companies to disclose.

Objectives:

Background: Children 9-13 years old in the US have suboptimal hydration status, with an average water intake of 496 mL/d (adequate intake for water is 2,100 mL/d in girls and 2,400 mL/d in boys, as per the Institute of Medicine). Studies have shown a significant inverse association between hydration status and body-fat percentage in children, although most studies failed to use Dual-X-Ray Absorptiometry Scan (DXA), the gold standard for body composition.

Objectives: To associate total fluid intake, hydration status, and body-fat percentage in children 10-13 years from the baseline visit of the MetA-Bone Trial, a trial to test the effect of soluble corn fiber supplementation on bone metabolism.

Methods: Body-fat percentage was measured using DXA, total fluid intake (mL/day) was assessed from three 24-hour dietary recalls using the Nutrition Data System for Research (NDSR), and hydration status was objectively measured using Urine Specific Gravity (USG) via 24-h urine collections. Statistical analyses included descriptive statistics and linear regression performed with

SPSS 26.0. Models were adjusted for age and sex.

Results: A total of 14 children (57.1% males) had complete data. Mean body-fat was 31.8 ± 8.53%, mean total water intake was 1634 ± 866 mL/day (54.5% were below the water adequate intake), and mean USG was 1.031 ± 0.023 (55.6% were dehydrated). Linear regression showed that total water intake and the objective hydration status were not significantly associated (β= 0.457; p= 0.216; adjusted for age and sex β= 0.461 p= 0.319). No associations were found between total water intake and body-fat percentage

(β= -0.254, p=0.452; adjusted for age and sex (β= -0.102, p=0.758) or between objective hydration status and body-fat percentage (β= 0.009; p= 0.982; adjusted for age and sex β= -0.034; p= -0.094).

Conclusions: Most children did not meet the adequate intake for water and were dehydrated. Total water intake and objective hydration status was not significantly associated among them and to body-fat percentage. A higher sample size may be necessary to find an association between hydration, body-fat percentage in children.

Funding Sources: Funding was supported by the National Institute of Health (Eunice Kennedy Shriver National Institute of Child Health and Human Development, NICHD), grant number 1R01HD098589-01.