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Critical malnutrition thresholds and educational system constraints in Sub-Saharan Africa: implications for

Ibtissem Gannoun1,2, Shaykhah Aldossari3, Majdi Argoubi1,2

  • 1Department of Economic Sciences and International Trade, University of Sousse, Sousse, Tunisia.

Frontiers in Nutrition
|May 15, 2026
PubMed

Insights

Child malnutrition in Sub-Saharan Africa significantly hinders education. A critical threshold of 4.37% prevalence drastically reduces secondary completion rates, necessitating targeted nutrition interventions for human capital development.

Area of Science:

  • Economics
  • Public Health
  • Neuroscience

Background:

  • Child malnutrition in Sub-Saharan Africa causes irreversible cognitive impairments.
  • Macroeconomic impacts on education systems remain under-quantified.
  • Identifying critical malnutrition thresholds is crucial for targeted interventions.

Purpose of the Study:

  • To quantify the macroeconomic impact of child malnutrition on education in Sub-Saharan Africa.
  • To identify critical malnutrition prevalence thresholds affecting educational outcomes.
  • To assess the cost-effectiveness of targeted nutrition interventions.

Main Methods:

  • Integrated Panel Threshold Regression with Temporal Graph Neural Networks.
  • Analyzed data from 35 Sub-Saharan African countries (1990-2024).
  • Identified structural breaks and spatial interdependencies.

Main Results:

  • A critical malnutrition threshold of 4.37% prevalence was identified, significantly impacting lower secondary completion.
  • Malnutrition above this threshold intensified educational costs six-fold.
  • High-vulnerability clusters identified in Sahel, Central Africa, and the East Horn.
  • Targeted interventions in critical-regime countries showed superior benefit-cost ratios (15:1-30:1).

Conclusions:

  • 78% of Sub-Saharan African countries exceed the critical malnutrition threshold.
  • Achieving Quality Education (SDG 4) requires addressing Zero Hunger (SDG 2) first.
  • Intensive nutrition interventions are foundational for human capital accumulation.
Abstract

Keywords:
Child malnutritionEducational attainment (EA)Graph Neural Networks (GNNs)Human capitalPanel threshold regression (PTR) modelThreshold effectssub-Saharan Africa

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