Summary
This study documents substantial geospatial variation in the micronutrient composition of cereal grains across Ethiopia and Malawi, driven by soil and environmental factors including pH, organic matter, temperature, rainfall and topography. For rural households relying on locally sourced cereals, residence location emerges as a primary determinant of dietary micronutrient intake. The authors argue that surveillance and interventions for micronutrient deficiency should incorporate subnational compositional data, as geographical effects may exceed the impact of standard interventions such as fortification or biofortification.
UK applicability
The findings have limited direct applicability to UK conditions, where food systems are geographically integrated at national and international scales, micronutrient fortification is established, and dietary diversity is typically greater. However, the methodological approach—linking soil and environmental factors to crop micronutrient composition—may inform UK research on nutrient density variation in domestic cereal production and regional food security planning.
Key measures
Grain micronutrient concentrations (calcium, iron, selenium, zinc); soil properties (pH, organic matter); environmental variables (temperature, rainfall, topography); biomarkers of selenium dietary status
Outcomes reported
The study measured calcium, iron, selenium and zinc concentrations in staple cereal grains across most cereal production areas in Ethiopia and Malawi. Geospatial variation in micronutrient composition was documented at subnational scales, with relationships between soil and environmental covariates identified for each micronutrient and crop type.
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