Dose-response trial of prophylactic zinc supplements, with or without copper, in young Ecuadorian children at risk of zinc deficiency.
Am J Clin Nutr
; 87(3): 723-33, 2008 Mar.
Article
em En
| MEDLINE
| ID: mdl-18326612
ABSTRACT
BACKGROUND:
Multiple studies have shown the benefits of zinc supplementation among young children in high-risk populations. However, the optimal dose and safe upper level of zinc have not been determined.OBJECTIVES:
The objectives of this study were to measure the effects of different doses of supplemental zinc on the plasma zinc concentration, morbidity, and growth of young children; to detect any adverse effects of 10 mg supplemental Zn on markers of copper or iron status; and to determine whether any adverse effects are alleviated by providing copper with zinc.DESIGN:
This randomized, double-masked, community-based intervention trial was conducted in 631 Ecuadorian children who were 12-30 mo old at baseline and who had initial length-for-age z scores <-1.3. Children received 1 of 5 daily supplements for 6 mo 3, 7, or 10 mg Zn as zinc sulfate, 10 mg Zn + 0.5 mg Cu as copper sulfate, or placebo.RESULTS:
The change in plasma zinc concentration from baseline was positively related to the zinc dose (P < 0.001). Zinc supplementation, including doses as low as 3 mg/d, reduced the incidence of diarrhea by 21-42% (P < 0.01). There were no other significant group-wise differences.CONCLUSIONS:
Zinc supplementation with a dose as low as 3 mg/d increased plasma zinc concentrations and reduced diarrhea incidence in the study population. There were no observed adverse effects of 10 mg Zn/d on indicators of copper or iron status. The current tolerable upper level of zinc recommended by the Institute of Medicine should be reassessed for young children.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Zinco
/
Desenvolvimento Infantil
/
Suplementos Nutricionais
/
Diarreia
Tipo de estudo:
Clinical_trials
/
Etiology_studies
/
Prevalence_studies
/
Risk_factors_studies
Limite:
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
País/Região como assunto:
America do sul
/
Ecuador
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article