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Nutrients. 2017 Nov 22;9(11). pii: E1272. doi: 10.3390/nu9111272.

A Cross-Sectional Study on the Association between 24-h Urine Osmolality and Weight Status in Older Adults.

Author information

1
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. patriciapadrao@fcna.up.pt.
2
EPIUnit-Instituto de Saúde Pública, Universidade do Porto, 4050-600 Porto, Portugal. patriciapadrao@fcna.up.pt.
3
Escola Superior de Saúde de Leiria, Instituto Politécnico de Leiria, 2411-901 Leiria, Portugal. patriciapadrao@fcna.up.pt.
4
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. sofia.limas.sousa@gmail.com.
5
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. ritacsguerra@gmail.com.
6
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. luisa.m.alvares@gmail.com.
7
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. alejandrosantos@fcna.up.pt.
8
I3S-Instituto de Investigação e Inovação em Saúde, 4200-135 Porto, Portugal. alejandrosantos@fcna.up.pt.
9
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. nunoborges@fcna.up.pt.
10
CINTESIS-Centre for Health Technology and Services Research, 4200-450 Porto, Portugal. nunoborges@fcna.up.pt.
11
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. claudiaafonso@fcna.up.pt.
12
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. tamaral@fcna.up.pt.
13
System Integration and Process Automation Unit (UISPA)-Institute of Mechanical Engineering (IDMEC), Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. tamaral@fcna.up.pt.
14
Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto, 4200-465 Porto, Portugal. pedromoreira@fcna.up.pt.
15
EPIUnit-Instituto de Saúde Pública, Universidade do Porto, 4050-600 Porto, Portugal. pedromoreira@fcna.up.pt.
16
Centro de Atividade Física, Saúde e Lazer, Universidade do Porto, 4200-450 Porto, Portugal. pedromoreira@fcna.up.pt.

Abstract

Data on the association between hydration and body weight in the elderly are scarce. The objective of this work was to quantify the association between 24-h urine osmolality and weight status in the elderly. A cross-sectional study was conducted within the Nutrition UP 65 study. A quota sampling was implemented to achieve a nationally representative sample of Portuguese older adults (≥65 years) according to age, sex, education and region. From a sample size of 1500 participants, 1315 were eligible for the present analysis, 57.3% were women and 23.5% were aged ≥80 years. Participants were grouped using tertiles of 24-h urine osmolality by sex. World Health Organization cutoffs were used to classify participants according to weight status. Multinomial multivariable logistic regression models were conducted to evaluate the association of tertiles of osmolality with weight status, adjusting for confounders. Odds Ratios (OR) and respective 95% Confidence Intervals (95% CI) were calculated. Being in the 3rd urine osmolality tertile (highest) was associated with a higher risk of being obese in men, OR = 1.97, 95% CI = 1.06, 3.66. No such association was found in women. These results highlight the need for implementing studies in order to clarify the association between hydration and weight status in the elderly.

KEYWORDS:

body mass index; elderly; hydration; obesity; urine osmolality; weight status

PMID:
29165353
PMCID:
PMC5707744
DOI:
10.3390/nu9111272
[Indexed for MEDLINE]
Free PMC Article

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