Healthy Changes in Some Cardiometabolic Risk Factors Accompany the Higher Summertime Serum 25-hydroxyvitamin D Concentrations in Iranian Children: National Food and Nutrition Surveillance

Overview

Journal Public Health Nutr

Publisher Cambridge University Press

Date 2018 Mar 28

PMID 29580303

Citations 6

Authors

Bahareh Nikooyeh

Zahra Abdollahi

Majid Hajifaraji

Hamid Alavi-Majd

Forouzan Salehi

Amir Hossein Yarparvar

Tirang R Neyestani

Affiliations

Soon will be listed here.

Abstract

Objective: To investigate seasonal variations of vitamin D status at different latitudes and if these changes are accompanied by corresponding variations in certain health parameters in children living in a broad latitudinal range in Iran.

Design: Longitudinal study.

Subjects: In total, 530 apparently healthy children aged 5-18 years were randomly selected from six regions of Iran with a latitudinal gradient from 29°N to 37·5°N. All anthropometric and biochemical assessments were performed twice during a year (summer, winter). High BMI (Z-score >1), low HDL cholesterol (150 mg/dl) were considered cardiometabolic risk factors.

Results: Serum 25-hydroxyvitamin D (25(OH)D) showed between-season variation, with significantly higher concentrations (mean (sd)) in summer v. winter (43 (29) v. 27 (18) nmol/l; P33°N v. <33°N: 4·5; 0·09, 9·0; P=0·04) were predictors of change of serum 25(OH)D between two seasons.

Conclusions: Summertime improvement of vitamin D status was accompanied by certain improved cardiometabolic risk factors, notably serum TAG, total cholesterol and BMI, in children.

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