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Key Considerations for Policymakers-Iodized Salt as a Vehicle for Iron Fortification: Current Evidence, Challenges,

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|February 14, 2021
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Summary

Double-fortified salt (DFS), combining iron with iodized salt, shows promise in reducing anemia and iron deficiency anemia in controlled studies. However, effectiveness in real-world programs is mixed due to production challenges and delivery limitations.

Keywords:
fortificationiodineiodizationironsalt

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Area of Science:

  • Public Health Nutrition
  • Food Fortification
  • Micronutrient Deficiency Prevention

Background:

  • Iron deficiency anemia remains a significant global health issue, particularly in vulnerable populations.
  • Double-fortified salt (DFS), which combines iron with iodized salt, has emerged as a potential strategy to combat this deficiency.
  • Existing evidence on DFS effectiveness in program settings is limited and shows mixed results.

Purpose of the Study:

  • To evaluate the efficacy and effectiveness of double-fortified salt (DFS) in preventing iron deficiency and anemia.
  • To explore the technical, financial, and logistical challenges associated with DFS production and delivery.
  • To assess the compatibility of DFS with global salt reduction initiatives.

Main Methods:

  • Review of efficacy studies demonstrating DFS impact on anemia and iron deficiency in controlled settings.
  • Analysis of effectiveness studies in program settings, considering DFS coverage and reported outcomes.
  • Examination of available iron formulations, their impact on iodized salt quality, and manufacturing requirements.
  • Assessment of financial implications, including production costs and market pricing.
  • Consideration of DFS alignment with World Health Organization (WHO) salt reduction guidelines.

Main Results:

  • Efficacy trials show DFS significantly reduces anemia and iron deficiency anemia.
  • Effectiveness data from program settings are mixed, influenced by DFS coverage and quality.
  • Adverse changes in DFS (discoloration, iodine loss) can occur, especially with low-quality iodized salt.
  • High-quality iodized salt and iron formulations, along with appropriate packaging, are crucial for DFS success.
  • DFS production incurs higher costs than standard iodized salt, impacting market expansion.
  • DFS is compatible with salt iodization goals and can align with salt reduction efforts if implemented carefully.

Conclusions:

  • DFS demonstrates a beneficial impact on hemoglobin levels in controlled efficacy trials.
  • Optimal production and delivery of DFS face challenges that require further development and adaptation.
  • If production and delivery realities can be addressed, DFS holds potential as a food-fortification vehicle to improve iron intake in deficient populations.