Plasma Zinc Concentration,Body Composition and Physical Activity in Obese Preschool Children |
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Authors: | G Weisstaub E Hertrampf D López de Romaña G Salazar C Bugueño C Castillo-Duran |
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Institution: | (1) Institute of Nutrition and Food Technology (INTA), Universidad de Chile, Macul, 5540 Santiago, Chile |
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Abstract: | Zinc (Zn) deficiency and obesity can be observed together in some developing countries. Zn deficiency may enhance fat deposition
and decrease lean mass accrual, which in turn, appears to influence physical activity (PA), although this has not yet been
evaluated in obese children. The objective of the study was to find out the association between measurements of plasma Zn
and serum leptin, body composition, and PA in Chilean obese preschool children. Seventy-two 18- to 36-month-old obese children
weight-for-length/height z score (WHZ) > 2.0 SD], belonging to low socioeconomic communities, participated in the study. Plasma Zn, serum leptin, weight,
waist circumference, height, total body water (TBW) assessed by deuterium isotopic dilution technique and daily activity,
measured by registering 48 h with an accelerometer, were evaluated. We found 82% of children with WHZ > 3 SD. The geometric
mean Zn intake was 6.2 ± 2.5 mg/day. The mean plasma Zn was 91.8 ± 11.4 μg/dL, with 10% of the children having levels <80 μg/dL.
No correlation was found between plasma Zn concentrations and either weight, WHZ, or waist circumference. Serum leptin was
lower in males than in females (2.9 ± 2.8 vs 6.8 ± 5.0 ng/mL, respectively; p < 0.001). TBW was different between males and females (56.2 ± 5.4 vs 52.8 ± 4.3% body weight, respectively; p = 0.004), but no significant association was found between TBW and plasma Zn. Moderate + intense PA, (as percentage of wake
time), was greater in males than in females (6.3 ± 3.1% vs 3.4 ± 2.3%, respectively; p < 0.001), but it was not significantly correlated to plasma Zn. In conclusion, plasma Zn was not associated with body composition
as assessed by TBW, serum leptin, or with the magnitude of physical activity in Chilean overweight preschool children. |
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Keywords: | Zinc Obesity Body Composition Deuterium Total body water |
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