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KMID : 1039620180080050747
Korean Journal of Family Practice
2018 Volume.8 No. 5 p.747 ~ p.751
The Association between Urine Specific Gravity and Obesity in Men in Korea: The Fifth Korean National Health and Nutrition Examination Survey in 2010-2012
Ha Jeong-Im

Kim Ji-Hyun
Park Jae-Min
Kim Kyoung-Jin
Oh Eun-Jung
Choi Jae-Kyung
Kweon Hyuk-Jung
Cho Dong-Young
Abstract
Background: As the prevalence of obesity is increasing worldwide, improving hydration status as a strategy to overcome weight-related problems is attracting attention. However, the relationship between hydration status and obesity remains uncertain. We aimed to investigate the association between inadequate hydration and obesity among men in Korea using urine specific gravity as a hydration marker.

Methods: In this study, we used data acquired from the Korean National Health and Nutrition Examination Survey, which was conducted during 2010?2012, and included men aged 20?59 years. The primary outcome of interest was body mass index, which is measured in continuous values and categorized as either obese (body mass index ¡Ã25 kg/m2) or normal (body mass index <25 kg/m2). Individuals with urine-specific gravity values of ¡Ã1.020 were considered inadequately hydrated. Linear and logistic regression analyses were performed with continuous body mass index and obesity status as the outcomes, respectively. Models were adjusted for known confounders, including age, regular exercise status, current smoking status, habitual coffee consumption, and regular alcohol intake.

Results: In this nationally representative sample (n=4,404), 48.02% of participants were inadequately hydrated. Individuals with inadequate hydration had a higher body mass index (P=0.048) than those who were adequately hydrated. After adjustment for potential confounding variables, the odds ratio (95% confidence interval) of the inadequate hydration group for obesity was 1.05 (0.84?1.32).

Conclusion: Inadequate hydration is positively associated with a higher body mass index but not with obesity.
KEYWORD
Inadequate Hydration, Body Mass Index, Obesity, Urine Specific Gravity
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