Volume 11 Supplement 3
Effect of preventive zinc supplementation on linear growth in children under 5 years of age in developing countries: a meta-analysis of studies for input to the lives saved tool
© Imdad and Bhutta; licensee BioMed Central Ltd. 2011
Published: 13 April 2011
Zinc plays an important role in cellular growth, cellular differentiation and metabolism. The results of previous meta-analyses evaluating effect of zinc supplementation on linear growth are inconsistent. We have updated and evaluated the available evidence according to Grading of Recommendations, Assessment, Development and Evaluation (GRADE) criteria and tried to explain the difference in results of the previous reviews.
A literature search was done on PubMed, Cochrane Library, IZiNCG database and WHO regional data bases using different terms for zinc and linear growth (height). Data were abstracted in a standardized form. Data were analyzed in two ways i.e. weighted mean difference (effect size) and pooled mean difference for absolute increment in length in centimeters. Random effect models were used for these pooled estimates. We have given our recommendations for effectiveness of zinc supplementation in the form of absolute increment in length (cm) in zinc supplemented group compared to control for input to Live Saves Tool (LiST).
There were thirty six studies assessing the effect of zinc supplementation on linear growth in children < 5 years from developing countries. In eleven of these studies, zinc was given in combination with other micronutrients (iron, vitamin A, etc). The final effect size after pooling all the data sets (zinc ± iron etc) showed a significant positive effect of zinc supplementation on linear growth [Effect size: 0.13 (95% CI 0.04, 0.21), random model] in the developing countries. A subgroup analysis by excluding those data sets where zinc was supplemented in combination with iron showed a more pronounced effect of zinc supplementation on linear growth [Weighed mean difference 0.19 (95 % CI 0.08, 0.30), random model]. A subgroup analysis from studies that reported actual increase in length (cm) showed that a dose of 10 mg zinc/day for duration of 24 weeks led to a net a gain of 0.37 (±0.25) cm in zinc supplemented group compared to placebo. This estimate is recommended for inclusion in Lives Saved Tool (LiST) model.
Zinc supplementation has a significant positive effect on linear growth, especially when administered alone, and should be included in national strategies to reduce stunting in children < 5 years of age in developing countries.
The association of zinc deficiency with growth retardation and hypogonadism was first described in 1963 from Iran  and is now well established from animal and human studies demonstrating that zinc plays a critical role in cellular growth, cellular differentiation and metabolism .
Several studies have been conducted to explore the effect of zinc supplementation on children’s growth. Although there have been several reviews published on this topic, to date few meta-analyses have been published in this regard [3–5]. The two meta-analyses by Brown et al. [3, 4] that included studies of zinc supplementation in pre-pubertal children concluded that zinc supplementation produces highly significant positive effect on height gain. In contrast, a recent meta-analysis by Ramakrishnan et al.  concluded that zinc supplementation was not associated with any significant positive effect on linear growth in children < 5 years of age.
We have reviewed the available literature and evaluated the quality of included studies according to Child Health Epidemiology Reference Group (CHERG) adaptation of Grading of Recommendations, Assessment, Development and Evaluation (GRADE) criteria [6, 7]. We have updated the previous meta-analyses and have tried to explore and explain the difference in results of the above mentioned meta-analyses. We have also generated an estimate for actual increase in length (cm) for input into Lives Saved Tool (LiST) model for a standard dose and duration of zinc supplementation in children < 5 years in developing countries.
To evaluate the effect of zinc supplementation on linear growth, we conducted a literature search on PubMed, Cochrane Library, IZiNCG database and WHO regional databases library as well as a manual check of available reviews and previous meta-analyses on the subject. There was no language restriction. The following search strategy was used for literature search: (“growth” OR “height” OR “weight” OR “stunting” OR growt* OR heigh* OR weigh* OR stuntin*) AND (“Zinc” OR “Zinc sulphate”) and limited to “clinical trial” and “humans”. The last date of search was March 3rd 2010.
The following inclusion criteria were used to identify the studies for data abstraction: a) the study was a randomized, placebo-controlled intervention trial conducted in a developing country b) the subjects were children less than 5 year of age c) the subjects were not premature infants; d) the subjects were free of chronic diseases, such as sickle cell disease, cystic fibrosis, or severe protein-energy malnutrition e) zinc was the only component of the supplement that differed between treatment groups and f) the supplemental zinc was provided for at least ≥8 weeks. There was no restriction on dose of zinc supplemented or formula used (e.g. Zinc sulphate or Zinc Gluconate etc). The developing countries were defined as countries with Gross National Income per capita (GNI) below US$11,905, according to World Bank . We excluded studies where zinc was provided in fortified food as this was considered a different intervention that has been reviewed elsewhere .
Data abstraction and validity assessment
For quality assessment, data were abstracted into standardized forms using variables as study identifiers and context, study design and limitations, intervention specifics, and outcome effects . Two authors entered the data and discrepancies were removed, if found. Individual studies were graded according to strengths and limitations of the study. Studies received an initial score of high if a randomized or cluster randomized trial and then the grade was decreased for each study design limitation, if applicable. A study was downgraded if there were limitations in the conduct of studies e.g. inadequate methods of sequence generation or allocation concealment and/or high loss to follow up (>20%). Risk of bias in the included studies was assessed according to latest Cochrane handbook and findings are presented in Additional File 1. Finally each study was assigned a final quality grade of “high” “moderate” “low” or “very low” on the basis of strengths and limitations of study [6, 10]. Studies receiving a grade of ‘very low’ were excluded from the analysis. The grading of overall (pooled) evidence was based on three components: (1) the volume and consistency of the evidence; (2) the size of the pooled effect and (3) the strength of the statistical evidence reflected in the p-value . A similar grading of ‘high’ ‘moderate’ ‘low’ and ‘very low’ was used for grading the overall evidence indicating the strength of an effect of the intervention on specific health outcome .
Quantitative data synthesis
The primary outcome was change in height [expressed in cms or height-for-age Z score (HAZ)]. For studies where mean change in height was not reported, it was calculated as the difference of mean post- and pre-intervention measurements. If studies did not report the standard deviation (SD) for change in height, it was calculated assuming that the correlation between the pre- and post-test variances was equal to the average correlation found in available studies. If studies reported the standard error (SE), we calculated SD by multiplying SE with square root of sample size. For studies that had different sample sizes at the beginning and the end of the intervention, the lower value of the two was used in analysis. The assessment of statistical heterogeneity in the pooled analysis was done by visual inspection i.e. the overlap of the confidence intervals among the studies, Chi square (P-value) of heterogeneity in the meta-analyses and I2 statistics. A low P value (less than 0.10) or a large chi-squared statistic relative to its degree of freedom and I2 values greater than 50% were taken as substantial and high heterogeneity. In situations of substantial or high heterogeneity being present, causes were explored by sensitivity analysis and random effects model were used.
In studies with factorial design i.e. (two or more intervention comparisons carried out simultaneously in a single study), only data in which zinc was the only difference between the two groups were included. For example, for iron-zinc factorial trials, results were included for comparisons of zinc only vs. placebo and zinc plus iron vs. iron only. In case of cluster randomized trials, cluster adjusted values were used.
Data were analyzed in two ways. In first analysis, we pooled the studies to get a weighted mean difference also called effect size. This value, also known as Cohen’s effect size, is useful in meta-analyses because it eliminates the problems of units of measurement (e.g. change in height in cm or HAZ scores) and duration, which may vary across studies [11, 12]. These effect sizes were calculated for individual studies by dividing the difference between the mean change in treatment and control groups by the pooled standard deviation. Random effect models were used for the primary analysis . We did a subgroup analysis for data sets where zinc was supplemented alone by excluding those data sets where it was given in combination with iron. This was based on results of some experimental studies that had shown that iron may decrease the absorption of zinc when supplemented together [14, 15]. We hypothesized that the preventive effect of zinc for stunting would be more prominent if supplemented alone rather than in combination with iron.
In the second analysis, we pooled the studies reporting change in height in cms to get a net change in length in intervention group compared to control. We also did a post hoc subgroup analysis for different daily dosages of zinc supplementation to get a point estimate for inclusion in the Live Saved Tool (LiST). More details about this analysis are provided in the results section (Recommendations for LiST model). All the meta-analyses were conducted using software Review Manager version 5 .
Characteristics of included studies
Study ID (ref)
Sample size (n)
Mean initial age (months)
Mean initial height (cm)
Mean initial HAZ score
Grade (High, moderate and low)
1 and 5
Umeta 2000 
Muller 2003 
Silva 2006 
Multicentre trial (Thailand, Veitnam and Indonesia)
Walker 2009 
Effect on linear growth
Information on change in height (in cm or HAZ scores) was available from 35 studies, which contained 47 group wise comparisons. In study by Fahmida et al. 2007 , only one data set was included in analysis (zinc alone vs. placebo) because comparison groups for other data sets (zinc + iron, zinc + iron + vitamin A) were not appropriate (no iron only or iron + vitamin A group). In study by Brown et al. 2007 , there were three intervention groups i.e. placebo, zinc alone (solution form) and zinc (in fortified food). We included comparison of zinc (solution form) vs. placebo and not that of zinc in fortified food vs. placebo. Iron was supplemented to both groups in study by Alarcon et al. 2004 . This study had been included in analysis of zinc + iron vs. iron alone and not that of zinc alone vs. control comparison.
Recommendations for LiST model
Results of effect size (weighed mean difference) are interpreted as the percent of non-overlap of the intervention group’s scores with those of the control group. An effect size (ES) of 0.0 indicates that the distribution of scores for the intervention group overlaps completely with the distribution of scores for the control group, and there is 0% non-overlap. An ES of 0.3 indicates a non-overlap of 21.3% in the two distributions. Effect size can be categorized as small (~0.2), medium (~0.5) or large (~0.8) . This shows that results of pooled effect size can only be interpreted as percent of non-overlap of results of two groups and an absolute quantitative estimate cannot be generated in the form of units of measurement .
Qualitative assessment of Trials for effect of zinc supplementation on linear growth
Summary of findings
No. of studies
Generalizability to Population of Interest
Generalizability to intervention of Interest
Mean Difference ( 95 % CI)
High, moderate, low, very low)
Effect of Zinc supplementation on linear growth: Zinc supplementation for a dose of 10 mg/day for a duration of 24 weeks
Heterogeneity 71 %. Random effect models used.
All the studies from developing countries
10 mg zinc/day for 24 weeks
Effect of zinc supplementation on linear growth has been evaluated previously [3–5]. The first and most widely known meta-analysis evaluating the effect of zinc supplementation on growth was conducted by Brown et al in 2002 . This review included studies with children until pre-puberty and studies from both developing and developed countries. Pooled results from 33 studies showed that zinc supplementation had a highly significant positive effect on linear growth (effect size = 0.350, 95% CI: 0.189, 0.511). In the latest review published by the same authors , more studies have been added to the previous (2002) analysis and the beneficial effect remained significant [effect size = 0.170 (95% CI: 0.075, 0.264)]. In contrast, another meta-analysis by Ramakrishnan et al. based on 43 studies found no significant effect of zinc supplementation on linear growth [effect size = 0.07 (95% CI: -0.03, 0.17)] in children < 5 years of age . Our results from included studies from developing countries and with children < 5 years of age showed that preventive zinc supplementation (zinc ± iron) had a significant effect on linear growth [Effect size = 0.13 (95 % CI 0.04, 0.21)]. If we include results from four excluded studies from developed countries [23–26], the effect size comes to be 0.14 (95% CI 0.05-0.22) and if the results of studies with children > 5 years are included, the estimate becomes 0.15 (95 % CI 0.07, 0.23).
Our results are in concordance with that of Brown et al. 2009  but at variance with the findings of Ramakrishnan et al 2009 . What are the reasons for these contradictory findings and the differences between these reviews? The main differences were in inclusion and exclusion criteria. We and Ramakrishnan et al (5) included studies with children < 5 years, while Brown et al. (3) also included children until pre-pubertal age. Both Brown et al. (3) and we excluded studies where zinc was supplemented in fortified foods, while Ramakrishanan et al. (5) included these as well. Brown et al. (3) also excluded those studies where SD for change in length was not reported in the paper; however we and Ramakrishnan included those (5). Do these differences explain the reasons for contradictory results? If we include zinc fortified studies with our analysis (all countries), the estimated effect size becomes 0.15 (95 % CI 0.06, 0.20), which indicates that excluding zinc fortification studies did not significantly alter the results and direction of effect. Excluding children > 5 years also did not change the results significantly as shown above. We could not find any further explanation for the difference in results of our analysis and these reviews.
Presentation of results in terms of absolute difference in the growth increment is described in previous reviews. In the previous review by Brown et al. in 2002 (4) data were analyzed in two ways i.e. pooled weighted mean difference (results discussed above) and actual increase in length (cm) . In the second analysis, they pooled results from 25 studies to get a net increment in length of 0.73 (±0.98) cm in zinc supplemented group compared to controls. These results were not however described for any particular dose or duration and the meta-views were also not provided to get an idea of the contribution of each study. On the other hand we have described pooled results for all the studies that reported absolute increment in length and also did a subgroup analysis for the most effective dose for a particular duration. This leads to an estimated effect size of 0.37 (±0.25) cm increase in linear growth in children <5 years, with a specific dose of 10 mg zinc/day for a duration of 24 weeks (Fig 3). The p-value for this estimate was 0.005 and quality grade for the pooled evidence was that of ‘moderate’ level. The most prominent contribution to this estimate comes from study by Umeta et al. in stunted children . This is understandable, as zinc seems to have more prominent effect on growth in stunted compared to non-stunted children . If results of this data set are omitted from analysis, the estimate becomes 0.36 (± 0.26) cm. In any case, keeping in mind the statistical significance, quality grade and specificity of estimate, this seems to be the most suitable input to LiST model, for an effect size estimate of zinc supplementation in prevention of stunting in children < 5 years of age in developing countries.
What does an extra gain of 0.37 cm means clinically? An average gain of this much in height would not be a huge effect but we need to take into account that that a single micronutrient would not be expected to result in such a substantial benefit at the first place. The results of this review confirms that preventive zinc supplementation indeed has an effect in promotion of growth of young children but this has to be connected with more comprehensive approaches that improve the diets of small children in general to get a more substantial effect. These efforts should especially focus on first two years of life and there should be a special attention to promote exclusive breastfeeding and practices of complementary feeding in addition to correcting micronutrient deficiencies. An analysis published in lancet undernutrition series in 2008 showed that education and counseling of caretakers in food-secure populations can improve growth in height (WMD 0.25; 95% CI: 0.01, 0.49) and providing complementary food, with or without education and counseling, can improve height in food insecure populations (WMD 0.41; 95% CI: 0.05, 0.76) . In an updated analysis for this series, we have shown that provision of complementary food (±nutrition counseling) lead to an extra gain of 0.54 cm (±0.38) and education of mothers about complementary feeding can lead to an extra gain of 0.49 cm (±0.50) in the intervention group compared to control . Thus, in order to get full advantage of relatively small benefit of correcting zinc deficiency, we must, at the same time, focus on interventions to improve complementary feeding and general nutritional status if the child. Future research should focus on strategies where correction of micronutrient deficiencies should be a part of a more general approach to improve the nutritional status of the child in general.
Do zinc and iron interact significantly when supplemented simultaneously? It has been demonstrated from several studies that iron and zinc have similar absorption and transport mechanisms . Experimental studies have also shown that simultaneous supplementation of iron and zinc may inhibit zinc absorption in these cells especially at high ratios of iron to zinc [14, 15, 73]. A review by Walker et al. (64) on interaction of zinc and iron in supplementation trials showed that combined supplementation of zinc and iron did not affect the biochemical status of zinc; however the data were not clear regarding morbidity and growth outcomes. In our review, subgroup analysis excluding studies in which zinc was co-administered with iron showed an increase in overall effect size confirming the likelihood of interaction (Fig 2). When we separately pooled these data sets (zinc + iron), the pooled effect size showed a negative trend -0.10 [95 % CI -0.21, 0.01]. These results were significantly different from overall estimate (p=0.0007). These analyses strongly suggest that addition of iron decreases the positive effect of zinc supplementation on linear growth through potential interference with absorption or bio-availability. We have, therefore, presently restricted our recommendation for zinc supplementation to studies with zinc supplementation alone.
We used rigorous eligibility criteria for inclusion of studies. For example, the minimum period of supplementation should be ≥8 wk because shorter periods may be insufficient for detecting a linear growth response. Furthermore, we excluded studies of premature infants and those suffering from chronic disease or severe protein-energy malnutrition as zinc requirements of these children might differ considerably from those of unaffected children [74, 75]. We also excluded studies in which zinc was supplemented in fortified food. Although tracer-element experimental studies had shown that zinc fortification of food increase total zinc absorption [76–78], relatively few community studies have found positive impacts of zinc fortification on serum zinc concentrations or functional indicators of zinc status . There is also insufficient evidence for ideal food vehicle for zinc fortification and also interaction of zinc with other micronutrient when fortified in a single food .
Preventive zinc supplementation seems to be a safe intervention. It has been suggested that high levels of zinc intake may interfere with normal iron and copper metabolism . Although we did not specifically look at adverse effects, results from previous reviews showed that preventive zinc supplementation in physiological doses do not significantly affect the indicators of iron (i.e. hemoglobin and/or ferritin level) and/or copper metabolism .
Our review has certain limitations. As our recommendations are limited to zinc supplementation alone vs. control/placebo, these results may not be readily applicable to countries where there are on-going national supplementation programs of iron-folate, for example, India. We expect that policy makers will assess local contexts and conditions while considering the feasibility of zinc supplementation programs. We were unable to identify any significant predictor of substantial heterogeneity in the pooled data. There may be factors, not examined by us, that might explain the observed differences. These include initial HAZ score (prevalence of stunting), mean initial age, baseline zinc deficiency, gender and HIV prevalence [4, 79–81]. Although there are relatively large number of studies and a funnel plot for zinc alone supplementation was relatively symmetrical (data not shown), there may be possible publication bias.
In conclusion, our review suggests that zinc supplementation has a positive effect on linear growth, especially when supplemented alone. Zinc supplementation in a dose of 10 mg/day for duration of 24 weeks led to an increase gain in length by 0.37 (± 0.25) cm among children < 5 years of age in developing countries compared to controls.
This work was supported in part by a grant to the US Fund for UNICEF from the Bill & Melinda Gates Foundation (grant 43386) to “Promote evidence-based decision making in designing maternal, neonatal and child health interventions in low- and middle-income countries”. We thank Dr Mohammad Yawar Yakoob for his critical feedback on the draft.
This article has been published as part of BMC Public Health Volume 11 Supplement 3, 2011: Technical inputs, enhancements and applications of the Lives Saved Tool (LiST). The full contents of the supplement are available online at http://www.biomedcentral.com/1471-2458/11?issue=S3.
- Moynahan EJ: Letter: Acrodermatitis enteropathica: a lethal inherited human zinc-deficiency disorder. Lancet. 1974, 2 (7877): 399-400. 10.1016/S0140-6736(74)91772-3.PubMed
- Prasad AS: Discovery of human zinc deficiency and studies in an experimental human model. Am J Clin Nutr. 1991, 53 (2): 403-412.PubMed
- Brown KH, Peerson JM, Baker SK, Hess SY: Preventive zinc supplementation among infants, preschoolers, and older prepubertal children. Food Nutr Bull. 2009, 30 (1 Suppl): S12-40.PubMed
- Brown KH, Peerson JM, Rivera J, Allen LH: Effect of supplemental zinc on the growth and serum zinc concentrations of prepubertal children: a meta-analysis of randomized controlled trials. Am J Clin Nutr. 2002, 75 (6): 1062-1071.PubMed
- Ramakrishnan U, Nguyen P, Martorell R: Effects of micronutrients on growth of children under 5 y of age: meta-analyses of single and multiple nutrient interventions. Am J Clin Nutr. 2009, 89 (1): 191-203. 10.3945/ajcn.2008.26862.PubMed
- Atkins D, Best D, Briss PA, Eccles M, Falck-Ytter Y, Flottorp S, Guyatt GH, Harbour RT, Haugh MC, Henry D, et al: Grading quality of evidence and strength of recommendations. BMJ. 2004, 328 (7454): 1490-10.1136/bmj.328.7454.1490.PubMed
- Walker N, Fischer-Walker C, Bryce J, Bahl R, Cousens S: writing for the CHERG Review Groups on Intervention Effects. Standards for CHERG Reviews of Intervention Effects on Child Survival. IJE. 2009
- Data - Country Classification. [http://web.worldbank.org/]
- Hess SY, Brown KH: Impact of zinc fortification on zinc nutrition. Food Nutr Bull. 2009, 30 (1 Suppl): S79-107.PubMed
- Walker N, Fischer-Walker C, Bryce J, Bahl R, Cousens S: Standards for CHERG reviews of intervention effects on child survival. Int J Epidemiol. 2010, 39 (Suppl 1): i21-31. 10.1093/ije/dyq036.PubMed CentralPubMed
- Cohen J: Statistical Power Analysis for the Behavioral Sciences. 1988, Hillsdale, NJ: Lawrence Earlbaum Associates
- Hunter JE, Schmidt FL: Methods of meta-analysis: correcting error and bias in research findings. 1990, Newbury Park, CA: Sage Publications
- Wolf F: Meta-analysis: quantitative methods for research synthesis. 1986, Newbury Park, CA: Sage Publications
- Kordas K, Stoltzfus RJ: New evidence of iron and zinc interplay at the enterocyte and neural tissues. J Nutr. 2004, 134 (6): 1295-1298.PubMed
- Troost FJ, Brummer RJ, Dainty JR, Hoogewerff JA, Bull VJ, Saris WH: Iron supplements inhibit zinc but not copper absorption in vivo in ileostomy subjects. Am J Clin Nutr. 2003, 78 (5): 1018-1023.PubMed
- RevMan: The Cochrane Colloboration. Review Manager (RevMan) 5 for Windows. 2003, Oxford England
- Gibson RS, Vanderkooy PD, MacDonald AC, Goldman A, Ryan BA, Berry M: A growth-limiting, mild zinc-deficiency syndrome in some southern Ontario boys with low height percentiles. Am J Clin Nutr. 1989, 49 (6): 1266-1273.PubMed
- Cavan KR, Gibson RS, Grazioso CF, Isalgue AM, Ruz M, Solomons NW: Growth and body composition of periurban Guatemalan children in relation to zinc status: a cross-sectional study. Am J Clin Nutr. 1993, 57 (3): 334-343.PubMed
- Castillo-Duran C, Garcia H, Venegas P, Torrealba I, Panteon E, Concha N, Perez P: Zinc supplementation increases growth velocity of male children and adolescents with short stature. Acta Paediatr. 1994, 83 (8): 833-837. 10.1111/j.1651-2227.1994.tb13154.x.PubMed
- Friis H, Ndhlovu P, Mduluza T, Kaondera K, Sandstrom B, Michaelsen KF, Vennervald BJ, Christensen NO: The impact of zinc supplementation on Schistosoma mansoni reinfection rate and intensities: a randomized, controlled trial among rural Zimbabwean schoolchildren. Eur J Clin Nutr. 1997, 51 (1): 33-37. 10.1038/sj.ejcn.1600359.PubMed
- Sayeg Porto MA, Oliveira HP, Cunha AJ, Miranda G, Guimaraes MM, Oliveira WA, dos Santos DM: Linear growth and zinc supplementation in children with short stature. J Pediatr Endocrinol Metab. 2000, 13 (8): 1121-1128. 10.1515/JPEM.2000.13.8.1121.PubMed
- Udomkesmalee E, Dhanamitta S, Sirisinha S, Charoenkiatkul S, Tuntipopipat S, Banjong O, Rojroongwasinkul N, Kramer TR, Smith JC: Effect of vitamin A and zinc supplementation on the nutriture of children in Northeast Thailand. Am J Clin Nutr. 1992, 56 (1): 50-57.PubMed
- Walravens PA, Krebs NF, Hambidge KM: Linear growth of low income preschool children receiving a zinc supplement. Am J Clin Nutr. 1983, 38 (2): 195-201.PubMed
- Walravens PA, Hambidge KM, Koepfer DM: Zinc supplementation in infants with a nutritional pattern of failure to thrive: a double-blind, controlled study. Pediatrics. 1989, 83 (4): 532-538.PubMed
- Walravens PA, Chakar A, Mokni R, Denise J, Lemonnier D: Zinc supplements in breastfed infants. Lancet. 1992, 340 (8821): 683-685. 10.1016/0140-6736(92)92229-9.PubMed
- Heinig MJ, Brown KH, Lonnerdal B, Dewey KG: Zinc supplementation does not affect growth, morbidity, or motor development of US term breastfed infants at 4-10 mo of age. Am J Clin Nutr. 2006, 84 (3): 594-601.PubMed
- Behrens RH, Tomkins AM, Roy SK: Zinc supplementation during diarrhoea, a fortification against malnutrition?. Lancet. 1990, 336 (8712): 442-443. 10.1016/0140-6736(90)91991-I.PubMed
- Simmer K, Khanum S, Carlsson L, Thompson RP: Nutritional rehabilitation in Bangladesh--the importance of zinc. Am J Clin Nutr. 1988, 47 (6): 1036-1040.PubMed
- Friel JK, Andrews WL, Matthew JD, Long DR, Cornel AM, Cox M, McKim E, Zerbe GO: Zinc supplementation in very-low-birth-weight infants. J Pediatr Gastroenterol Nutr. 1993, 17 (1): 97-104. 10.1097/00005176-199307000-00015.PubMed
- Gatheru Z, Kinoti S, Alwar J, Mwita M: Serum zinc levels in children with kwashiorkor aged one to three years at Kenyatta National Hospital and the effect of zinc supplementation during recovery. East Afr Med J. 1988, 65 (10): 670-679.PubMed
- Golden BE, Golden MH: Effect of zinc on lean tissue synthesis during recovery from malnutrition. Eur J Clin Nutr. 1992, 46 (10): 697-706.PubMed
- Khanum S, Alam AN, Anwar I, Akbar Ali M, Mujibur Rahaman M: Effect of zinc supplementation on the dietary intake and weight gain of Bangladeshi children recovering from protein-energy malnutrition. Eur J Clin Nutr. 1988, 42 (8): 709-714.PubMed
- Hong ZY, Zhang YW, Xu JD, Zhou JD, Gao XL, Liu XG, Shi YY: Growth promoting effect of zinc supplementation in infants of high-risk pregnancies. Chin Med J (Engl). 1992, 105 (10): 844-848.
- Bates CJ, Evans PH, Dardenne M, Prentice A, Lunn PG, Northrop-Clewes CA, Hoare S, Cole TJ, Horan SJ, Longman SC, et al: A trial of zinc supplementation in young rural Gambian children. Br J Nutr. 1993, 69 (1): 243-255. 10.1079/BJN19930026.PubMed
- Dirren H, Barclay D, Ramos JG, Lozano R, Montalvo MM, Davila N, Mora JO: Zinc supplementation and child growth in Ecuador. Adv Exp Med Biol. 1994, 352: 215-222.PubMed
- Castillo-Duran C, Rodriguez A, Venegas G, Alvarez P, Icaza G: Zinc supplementation and growth of infants born small for gestational age. J Pediatr. 1995, 127 (2): 206-211. 10.1016/S0022-3476(95)70296-2.PubMed
- Ninh NX, Thissen JP, Collette L, Gerard G, Khoi HH, Ketelslegers JM: Zinc supplementation increases growth and circulating insulin-like growth factor I (IGF-I) in growth-retarded Vietnamese children. Am J Clin Nutr. 1996, 63 (4): 514-519.PubMed
- Sempertegui F, Estrella B, Correa E, Aguirre L, Saa B, Torres M, Navarrete F, Alarcon C, Carrion J, Rodriguez , et al: Effects of short-term zinc supplementation on cellular immunity, respiratory symptoms, and growth of malnourished Equadorian children. Eur J Clin Nutr. 1996, 50 (1): 42-46.PubMed
- Ruz M, Castillo-Duran C, Lara X, Codoceo J, Rebolledo A, Atalah E: A 14-mo zinc-supplementation trial in apparently healthy Chilean preschool children. Am J Clin Nutr. 1997, 66 (6): 1406-1413.PubMed
- Kikafunda JK, Walker AF, Allan EF, Tumwine JK: Effect of zinc supplementation on growth and body composition of Ugandan preschool children: a randomized, controlled, intervention trial. Am J Clin Nutr. 1998, 68 (6): 1261-1266.PubMed
- Lira PI, Ashworth A, Morris SS: Effect of zinc supplementation on the morbidity, immune function, and growth of low-birth-weight, full-term infants in northeast Brazil. Am J Clin Nutr. 1998, 68 (2 Suppl): 418S-424S.PubMed
- Meeks Gardner J, Witter MM, Ramdath DD: Zinc supplementation: effects on the growth and morbidity of undernourished Jamaican children. Eur J Clin Nutr. 1998, 52 (1): 34-39. 10.1038/sj.ejcn.1600509.PubMed
- Rivera JA, Ruel MT, Santizo MC, Lonnerdal B, Brown KH: Zinc supplementation improves the growth of stunted rural Guatemalan infants. J Nutr. 1998, 128 (3): 556-562.PubMed
- Smith JC, Makdani D, Hegar A, Rao D, Douglass LW: Vitamin A and zinc supplementation of preschool children. J Am Coll Nutr. 1999, 18 (3): 213-222.PubMed
- Umeta M, West CE, Haidar J, Deurenberg P, Hautvast JG: Zinc supplementation and stunted infants in Ethiopia: a randomised controlled trial. Lancet. 2000, 355 (9220): 2021-2026. 10.1016/S0140-6736(00)02348-5.PubMed
- Castillo-Duran C, Perales CG, Hertrampf ED, Marin VB, Rivera FA, Icaza G: Effect of zinc supplementation on development and growth of Chilean infants. J Pediatr. 2001, 138 (2): 229-235. 10.1067/mpd.2001.110530.PubMed
- Dijkhuizen MA, Wieringa FT, West CE, Martuti S, Muhilal : Effects of iron and zinc supplementation in Indonesian infants on micronutrient status and growth. J Nutr. 2001, 131 (11): 2860-2865.PubMed
- Osendarp SJ, Santosham M, Black RE, Wahed MA, van Raaij JM, Fuchs GJ: Effect of zinc supplementation between 1 and 6 mo of life on growth and morbidity of Bangladeshi infants in urban slums. Am J Clin Nutr. 2002, 76 (6): 1401-1408.PubMed
- Muller O, Garenne M, Reitmaier P, Van Zweeden AB, Kouyate B, Becher H: Effect of zinc supplementation on growth in West African children: a randomized double-blind placebo-controlled trial in rural Burkina Faso. Int J Epidemiol. 2003, 32 (6): 1098-1102. 10.1093/ije/dyg190.PubMed
- Sur D, Gupta DN, Mondal SK, Ghosh S, Manna B, Rajendran K, Bhattacharya SK: Impact of zinc supplementation on diarrheal morbidity and growth pattern of low birth weight infants in kolkata, India: a randomized, double-blind, placebo-controlled, community-based study. Pediatrics. 2003, 112 (6 Pt 1): 1327-1332. 10.1542/peds.112.6.1327.PubMed
- Alarcon K, Kolsteren PW, Prada AM, Chian AM, Velarde RE, Pecho IL, Hoeree TF: Effects of separate delivery of zinc or zinc and vitamin A on hemoglobin response, growth, and diarrhea in young Peruvian children receiving iron therapy for anemia. Am J Clin Nutr. 2004, 80 (5): 1276-1282.PubMed
- Black MM, Baqui AH, Zaman K, Ake Persson L, El Arifeen S, Le K, McNary SW, Parveen M, Hamadani JD, Black RE: Iron and zinc supplementation promote motor development and exploratory behavior among Bangladeshi infants. Am J Clin Nutr. 2004, 80 (4): 903-910.PubMed
- Black MM, Sazawal S, Black RE, Khosla S, Kumar J, Menon V: Cognitive and motor development among small-for-gestational-age infants: impact of zinc supplementation, birth weight, and caregiving practices. Pediatrics. 2004, 113 (5): 1297-1305. 10.1542/peds.113.5.1297.PubMed CentralPubMed
- Lind T, Lonnerdal B, Stenlund H, Gamayanti IL, Ismail D, Seswandhana R, Persson LA: A community-based randomized controlled trial of iron and zinc supplementation in Indonesian infants: effects on growth and development. Am J Clin Nutr. 2004, 80 (3): 729-736.PubMed
- Penny ME, Marin RM, Duran A, Peerson JM, Lanata CF, Lonnerdal B, Black RE, Brown KH: Randomized controlled trial of the effect of daily supplementation with zinc or multiple micronutrients on the morbidity, growth, and micronutrient status of young Peruvian children. Am J Clin Nutr. 2004, 79 (3): 457-465.PubMed
- Brooks WA, Santosham M, Naheed A, Goswami D, Wahed MA, Diener-West M, Faruque AS, Black RE: Effect of weekly zinc supplements on incidence of pneumonia and diarrhoea in children younger than 2 years in an urban, low-income population in Bangladesh: randomised controlled trial. Lancet. 2005, 366 (9490): 999-1004. 10.1016/S0140-6736(05)67109-7.PubMed
- Gardner JM, Powell CA, Baker-Henningham H, Walker SP, Cole TJ, Grantham-McGregor SM: Zinc supplementation and psychosocial stimulation: effects on the development of undernourished Jamaican children. Am J Clin Nutr. 2005, 82 (2): 399-405.PubMed
- Berger J, Ninh NX, Khan NC, Nhien NV, Lien DK, Trung NQ, Khoi HH: Efficacy of combined iron and zinc supplementation on micronutrient status and growth in Vietnamese infants. Eur J Clin Nutr. 2006, 60 (4): 443-454. 10.1038/sj.ejcn.1602336.PubMed
- Olney DK, Pollitt E, Kariger PK, Khalfan SS, Ali NS, Tielsch JM, Sazawal S, Black R, Allen LH, Stoltzfus RJ: Combined iron and folic acid supplementation with or without zinc reduces time to walking unassisted among Zanzibari infants 5- to 11-mo old. J Nutr. 2006, 136 (9): 2427-2434.PubMed
- Silva AP, Vitolo MR, Zara LF, Castro CF: Effects of zinc supplementation on 1- to 5-year old children. J Pediatr (Rio J). 2006, 82 (3): 227-231. 10.2223/JPED.1480.
- Wasantwisut E, Winichagoon P, Chitchumroonchokchai C, Yamborisut U, Boonpraderm A, Pongcharoen T, Sranacharoenpong K, Russameesopaphorn W: Iron and zinc supplementation improved iron and zinc status, but not physical growth, of apparently healthy, breast-fed infants in rural communities of northeast Thailand. J Nutr. 2006, 136 (9): 2405-2411.PubMed
- Fahmida U, Rumawas JS, Utomo B, Patmonodewo S, Schultink W: Zinc-iron, but not zinc-alone supplementation, increased linear growth of stunted infants with low haemoglobin. Asia Pac J Clin Nutr. 2007, 16 (2): 301-309.PubMed
- Dijkhuizen MA, Winichagoon P, Wieringa FT, Wasantwisut E, Utomo B, Ninh NX, Hidayat A, Berger J: Zinc supplementation improved length growth only in anemic infants in a multi-country trial of iron and zinc supplementation in South-East Asia. J Nutr. 2008, 138 (10): 1969-1975.PubMed
- Wuehler SE, Sempertegui F, Brown KH: Dose-response trial of prophylactic zinc supplements, with or without copper, in young Ecuadorian children at risk of zinc deficiency. Am J Clin Nutr. 2008, 87 (3): 723-733.PubMed
- Fischer Walker CL, Baqui AH, Ahmed S, Zaman K, El Arifeen S, Begum N, Yunus M, Black RE, Caulfield LE: Low-dose weekly supplementation of iron and/or zinc does not affect growth among Bangladeshi infants. Eur J Clin Nutr. 2009, 63 (1): 87-92. 10.1038/sj.ejcn.1602905.PubMed
- Mozaffari-Khosravi H, Shakiba M, Eftekhari MH, Fatehi F: Effects of zinc supplementation on physical growth in 2-5-year-old children. Biol Trace Elem Res. 2009, 128 (2): 118-127. 10.1007/s12011-008-8261-1.PubMed
- Brown KH, Lopez de Romana D, Arsenault JE, Peerson JM, Penny ME: Comparison of the effects of zinc delivered in a fortified food or a liquid supplement on the growth, morbidity, and plasma zinc concentrations of young Peruvian children. Am J Clin Nutr. 2007, 85 (2): 538-547.PubMed
- Rosado JL, Lopez P, Munoz E, Martinez H, Allen LH: Zinc supplementation reduced morbidity, but neither zinc nor iron supplementation affected growth or body composition of Mexican preschoolers. Am J Clin Nutr. 1997, 65 (1): 13-19.PubMed
- Cochrane Handbook for Systematic Reviews of Interventions. Edited by: Higgins JPT, Green S. 2008, Version 5.0.2 [updated September 2009], [http://www.cochrane-handbook.org]
- Bhutta ZA, Ahmed T, Black RE, Cousens S, Dewey K, Giugliani E, Haider BA, Kirkwood B, Morris SS, Sachdev HP, et al: What works? Interventions for maternal and child undernutrition and survival. Lancet. 2008, 371 (9610): 417-440. 10.1016/S0140-6736(07)61693-6.PubMed
- Imdad A, Yakoob MY, Bhutta ZA: Impact of maternal education about complementary feeding and provision of complementary foods on child growth in developing countries. BMC Public Health. 2011, 11 (Suppl 3): S25-10.1186/1471-2458-11-S3-S25.PubMed CentralPubMed
- Garrick MD, Dolan KG, Horbinski C, Ghio AJ, Higgins D, Porubcin M, Moore EG, Hainsworth LN, Umbreit JN, Conrad ME, et al: DMT1: a mammalian transporter for multiple metals. Biometals. 2003, 16 (1): 41-54. 10.1023/A:1020702213099.PubMed
- Arredondo M, Martinez R, Nunez MT, Ruz M, Olivares M: Inhibition of iron and copper uptake by iron, copper and zinc. Biol Res. 2006, 39 (1): 95-102. 10.4067/S0716-97602006000100011.PubMed
- Doherty CP, Sarkar MA, Shakur MS, Ling SC, Elton RA, Cutting WA: Zinc and rehabilitation from severe protein-energy malnutrition: higher-dose regimens are associated with increased mortality. Am J Clin Nutr. 1998, 68 (3): 742-748.PubMed
- Higashi A, Ikeda T, Iribe K, Matsuda I: Zinc balance in premature infants given the minimal dietary zinc requirement. J Pediatr. 1988, 112 (2): 262-266. 10.1016/S0022-3476(88)80067-2.PubMed
- Hansen M, Samman S, Madsen LT, Jensen M, Sorensen SS, Sandstrom B: Folic acid enrichment of bread does not appear to affect zinc absorption in young women. Am J Clin Nutr. 2001, 74: 125-129.PubMed
- López de Romaña D, Salazar M, Hambidge KM, Penny ME, Peerson JM, Krebs NF, Brown KH: Longitudinal measurements of zinc absorption in Peruvian children consuming wheat products fortified with iron only or iron and 1 of 2 amounts of zinc. Am J Clin Nutr. 2005, 81: 637-647.PubMed
- Sandström B, Arvidsson B, Cederblad A, Bjorn-Rasmussen E: Zinc absorption from composite meals.I.The significance of wheat extraction rate, zinc, calcium, and protein content in meals based on bread. Am J Clin Nutr. 1980, 739-745.
- Kupka R, Fawzi W: Zinc nutrition and HIV infection. Nutr Rev. 2002, 60 (3): 69-79. 10.1301/00296640260042739.PubMed
- Webb P, Nishida C, Darnton-Hill I: Age and gender as factors in the distribution of global micronutrient deficiencies. Nutr Rev. 2007, 65: 233-245. 10.1111/j.1753-4887.2007.tb00300.x.PubMed
- Bobat R, Coovadia H, Stephen C, Naidoo KL, McKerrow N, Black RE, Moss WJ: Safety and efficacy of zinc supplementation for children with HIV-1 infection in South Africa: a randomised double-blind placebo-controlled trial. Lancet. 2005, 366 (9500): 1862-1867. 10.1016/S0140-6736(05)67756-2.PubMed
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