Impact of micronutrient fortification of yoghurt on micronutrient status markers and growth – a randomized double blind controlled trial among school children in Bangladesh

BMC Public Health

Robert E Black¹  Asmaul Husna²  Jahangir Alam²  Saikat Deb³  Archana Sarkar³  Pratibha Dhingra³  Arup Dutta³  Usha Dhingra¹  AKM Ahsan Habib²  Sunil Sazawal¹ 

[1] Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD USA;Department of Community Medicine, Shaheed Ziaur Rahman Medical College, Bogra, Bangladesh;Center for Micronutrient Research, Department of Biochemistry, Annamalai University, Tamil Nadu, India

关键词: Zinc;    Bangladesh;    Iodine;    Retinol binding protein;    Micronutrient fortification;   

Others  :  1162167
DOI  :  10.1186/1471-2458-13-514

 received in 2012-02-22, accepted in 2013-04-19,  发布年份 2013

【 摘 要 】

Background

Interventions providing foods fortified with multiple micronutrients can be a cost-effective and sustainable strategy to improve micronutrient status and physical growth of school children. We evaluated the effect of micronutrient-fortified yoghurt on the biochemical status of important micronutrients (iron, zinc, iodine, vitamin A) as well as growth indicators among school children in Bogra district of Bangladesh.

Methods

In a double-masked randomized controlled trial (RCT) conducted in 4 primary schools, 1010 children from classes 1–4 (age 6–9 years) were randomly allocated to receive either micronutrient fortified yoghurt (FY, n = 501) or non-fortified yoghurt (NFY, n = 509). For one year, children were fed with 60 g yoghurt everyday providing 30% RDA for iron, zinc, iodine and vitamin A. Anthropometric measurements and blood/urine samples were collected at base-, mid- and end-line. All children (FY, n = 278, NFY, n = 293) consenting for the end-line blood sample were included in the present analyses.

Results

Both groups were comparable at baseline for socio-economic status variables, micronutrient status markers and anthropometry measures. Compliance was similar in both the groups. At baseline 53.4% of the population was anemic; 2.1% was iron deficient (ferritin <15.0 μg/L and TfR > 8.3 mg/L). Children in the FY group showed improvement in Hb (mean difference: 1.5; 95% CI: 0.4-2.5; p = 0.006) as compared to NFY group. Retinol binding protein (mean diff: 0.05; 95% CI: 0.002-0.09; p = 0.04) and iodine levels (mean difference: 39.87; 95% CI: 20.39-59.35; p < 0.001) decreased between base and end-line but the decrease was significantly less in the FY group. Compared to NFY, the FY group had better height gain velocity (mean diff: 0.32; 95% CI: 0.05-0.60; p = 0.02) and height-for-age z-scores (mean diff: 0.18; 95% CI: 0.02-0.33; p = 0.03). There was no difference in weight gain velocity, weight-for-age z-scores or Body Mass Index z-scores.

Conclusion

In the absence of iron deficiency at baseline the impact on iron status would not be expected to be observed and hence cannot be evaluated. Improved Hb concentrations in the absence of a change in iron status suggest improved utilization of iron possibly due to vitamin A and zinc availability. Fortification improved height gain without affecting weight gain.

Trial registration

ClinicalTrial.gov: NCT00980733

【 授权许可】

   
2013 Sazawal et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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