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The impact of vitamin D food fortification and health outcomes in children: a systematic review and meta-regression
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AbstractObjectiveVitamin D (vitD) deficiency is a global childhood health problem. Food fortification is a promising strategy to curb vitD deficiency. We aimed to assess the effectiveness of utilizing vitD fortification in staple foods to improve 25hydroxyvitamin D (25(OH)D) concentration and to reduce the prevalence of vitD deficiency among healthy children.MethodsWe conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) evaluating the use of vitD fortified food products compared to no fortification among healthy children aged 1–18 years old. We searched Medline, Embase, Global Health, and Cochrane (CENTRAL) databases from database inception until May 2019. Independently, six reviewers in pairs screened titles and abstracts, assessed the full text for eligibility, and performed data extraction and quality assessment. The primary outcome is the impact of fortification on 25(OH)D concentration. The secondary outcomes included the impact of fortification on the prevalence of vitD deficiency, school performance, cognitive function, school absences, infection rate, hospital admission length, and compliance with fortified food product consumption.ResultsWe identified 2229 articles. After assessing eligibility, 20 RCTs met the inclusion criteria. The eligible RCTs assessed the fortification of milk, cereal, juice, bread, yogurt, and cheese compared with no fortification. All RCTs, except for three, had a low risk of bias. Food fortification improved 25(OH)D concentration by a mean difference (MD) of 15.51 nmol/L (95% confidence interval (CI) 6.28, 24.74;I2= 99%), which resulted in a mean increase of 3 nmol/l for every 100 IU of vitD, when adjusted for baseline 25(OH)D concentration and country latitude. Additionally, the prevalence of vitD deficiency decreased by a risk ratio of 0.53 (95% CI 0.41, 0.69;I2= 95%), and cognitive function improved by a MD of 1.22 intelligence quotient (IQ) points (95% CI 0.65, 1.79;I2= 0%). The overall evidence quality was high.ConclusionVitD food fortification is an effective way to improve 25(OH)D concentration, prevent vitD deficiency, and improve IQ levels.Systematic review registrationPROSPEROCRD42017057631
Springer Science and Business Media LLC
Title: The impact of vitamin D food fortification and health outcomes in children: a systematic review and meta-regression
Description:
AbstractObjectiveVitamin D (vitD) deficiency is a global childhood health problem.
Food fortification is a promising strategy to curb vitD deficiency.
We aimed to assess the effectiveness of utilizing vitD fortification in staple foods to improve 25hydroxyvitamin D (25(OH)D) concentration and to reduce the prevalence of vitD deficiency among healthy children.
MethodsWe conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) evaluating the use of vitD fortified food products compared to no fortification among healthy children aged 1–18 years old.
We searched Medline, Embase, Global Health, and Cochrane (CENTRAL) databases from database inception until May 2019.
Independently, six reviewers in pairs screened titles and abstracts, assessed the full text for eligibility, and performed data extraction and quality assessment.
The primary outcome is the impact of fortification on 25(OH)D concentration.
The secondary outcomes included the impact of fortification on the prevalence of vitD deficiency, school performance, cognitive function, school absences, infection rate, hospital admission length, and compliance with fortified food product consumption.
ResultsWe identified 2229 articles.
After assessing eligibility, 20 RCTs met the inclusion criteria.
The eligible RCTs assessed the fortification of milk, cereal, juice, bread, yogurt, and cheese compared with no fortification.
All RCTs, except for three, had a low risk of bias.
Food fortification improved 25(OH)D concentration by a mean difference (MD) of 15.
51 nmol/L (95% confidence interval (CI) 6.
28, 24.
74;I2= 99%), which resulted in a mean increase of 3 nmol/l for every 100 IU of vitD, when adjusted for baseline 25(OH)D concentration and country latitude.
Additionally, the prevalence of vitD deficiency decreased by a risk ratio of 0.
53 (95% CI 0.
41, 0.
69;I2= 95%), and cognitive function improved by a MD of 1.
22 intelligence quotient (IQ) points (95% CI 0.
65, 1.
79;I2= 0%).
The overall evidence quality was high.
ConclusionVitD food fortification is an effective way to improve 25(OH)D concentration, prevent vitD deficiency, and improve IQ levels.
Systematic review registrationPROSPEROCRD42017057631.
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