WSI Visual Brief

Hunger is not one number

Four measures that answer four different questions.

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Main takeaway

Chronic hunger, food-access difficulty, acute food crises, and child wasting are related. They are not interchangeable, and their headline figures should not be added together.

At a glance

Four headline numbers - four different universes

News reports about hunger often use very different figures. The numbers can all be accurate because they cover different people, periods, geographic universes, experiences, and outcomes.

about 645 millionUndernourishment2025 | World

about 2.1 billionModerate or severe food insecurity2025 | World

266 millionHigh acute food insecurity2025 | 47 countries and territories covered by GRFC 2026

42.8 millionChild wasting2024 | World

Four separate cards with headline figures for chronic hunger, food insecurity, acute food crises, and child wasting. — The four figures deliberately use separate cards rather than a shared quantitative axis.

1. Four measures answer four questions

Undernourishment concerns long-term dietary-energy inadequacy. FIES records lived difficulty accessing adequate food. Acute food-insecurity systems classify urgent conditions in analysed crisis settings. Wasting is a physical child-nutrition outcome.

Four large cards explaining what each measure asks, who it covers, and its time basis. — The useful comparison is conceptual, not arithmetic.

2. Severe food insecurity varies widely

The completed WSI FIES profile contains 125 country or territory records with matched 2023-2025 prevalence estimates. The bands show the distribution without creating a country league table.

Bar chart of 125 places grouped by severe food-insecurity prevalence. — Source: FAOSTAT FIES; validated WSI extract. The bands are descriptive, not official severity categories.

3. Acute food insecurity is a severity classification

Across the validated 14-country Cadre Harmonise snapshot, 52.3 million people were in Phase 3 or worse. The corrected chart shows mutually exclusive Phase 3, Phase 4, and Phase 5 populations.

Horizontal bars showing exclusive Phase 3, Phase 4, and Phase 5 populations. — Source: validated 14-country Cadre Harmonise profile. Phase 3 and Phase 4 exclusive counts are derived from approved cumulative controls.

4. Most children affected by wasting lived in Asia and Africa

The 2025 JME edition estimated 42.8 million children under five with wasting in 2024, including 12.2 million with severe wasting. Regional figures are rounded as published.

Grouped regional bars showing total and severe wasting among children under five. — Source: UNICEF/WHO/World Bank Joint Child Malnutrition Estimates, 2025 edition.

5. Severe wasting is part of total wasting

Severe wasting accounted for about 28.5% of the global number of children with wasting in 2024. It is not an additional population to add to the total.

Donut chart showing severe and other wasting within the global total. — Source: UNICEF/WHO/World Bank Joint Child Malnutrition Estimates, 2025 edition.

Which question does each measure answer?

Measure	Question	Universe	Time basis
Undernourishment (PoU)	Who is likely to have chronically insufficient dietary energy?	Global	Annual model estimate / multi-year statistical framework
FIES	Who reports difficulty accessing adequate food?	Global and country estimates	Past 12 months / official reporting period
IPC/CH and GRFC	Who in analyzed crisis settings needs urgent action?	Selected crisis countries/areas	Current or projected acute analysis period
Child wasting	Which children have a serious physical nutrition outcome?	Global and regional estimates	Survey/model reference year