Objectives: Mineral deficiencies due to inadequate dietary supply are likely to be widespread in
Malawi. However, there is insufficient reliable data on mineral supplies and deficiency risks at
scales useful for policy-makers. This study provides mineral supply estimates at the level of
Extension Planning Area (EPA).
Methods: Food samples were collected and analysed by inductively coupled plasma mass
spectrometry (ICPMS) to generate a national food mineral composition database for Malawi
according to soil type. Composition data were combined with food consumption data from the Third
Malawi Integrated Household Survey in order to provide spatially-disaggregated dietary mineral
supply estimates.
Results: There is great regional variation in dietary mineral supplies due to soil type and dietary
choices. On "calcaric" soils, the national average diet contains 791 mg Ca, 77 µg Se and 14 mg
Zn, while on "non-calcaric" soils the average diet contains 715 mg Ca, 36 µg Se, and 11 mg Zn.
Supplies of Ca by EPA ranged from 123 mg to > 2000 mg capita-1 d-1
, while Se ranged from 10 µg
to > 100 µg and Zn from 4.4 mg to > 20 mg. Fish provide 52, 38 and 22% of all Ca, Se and Zn
supplies, respectively, in the national average diet.