Food security: availability, access, utilisation, stability
What food security means, the four pillars, how hunger is measured, entitlements and famines, malnutrition in all its forms, and a food balance sum.
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The world produces enough food to feed everyone, yet hundreds of millions of people go hungry and billions cannot afford a healthy diet. Hunger is not only a question of how much food is grown, but of who can obtain it, whether their bodies can use it, and whether they can count on it through droughts, wars and price spikes. The idea of food security captures all of these, and it guides agricultural and social policy worldwide.
The definition and pillars of food security, its measurement and its causes are standard topics in agricultural economics, nutrition and development studies.
The definition
The 1996 World Food Summit in Rome agreed the definition used today:
It applies at different levels: global, national, household and individual. A country can be food secure in aggregate while many households in it are not.
The four pillars
- Availability: enough food is physically present, through domestic production, stocks, imports and food aid.
- Access: households can obtain it, through income, prices, own production, markets, transfers and social rights. Economic access (affordability) and physical access (roads, markets) both matter.
- Utilisation: people can make good use of food, which depends on diet quality, food safety, clean water, sanitation, health care and knowledge of nutrition.
- Stability: availability, access and utilisation hold over time, through seasons, bad harvests, price spikes, conflicts and economic shocks.
In 2020, the High Level Panel of Experts of the UN Committee on World Food Security proposed adding agency (people's ability to make choices about food and to shape food systems) and sustainability (food systems that do not undermine future food security).
Entitlements and famines
In Poverty and Famines (1981), Amartya Sen showed that the Bengal famine of 1943 occurred without a large fall in food availability: wartime inflation and speculation destroyed the entitlements, the ability to command food through wages, production or trade, of landless labourers, fishers and artisans. Famines, he argued, are usually failures of access rather than of supply, and they are rare in functioning democracies with a free press. Sen received the Nobel Memorial Prize in Economic Sciences in 1998.
Food insecurity: chronic and transitory
- Chronic food insecurity: a persistent inability to meet food needs, linked to poverty.
- Transitory food insecurity: a temporary drop, from a drought, price spike or job loss.
- Seasonal food insecurity: the "hungry season" before harvest in many rural areas.
Malnutrition in all its forms
- Undernutrition: wasting (low weight for height), stunting (low height for age) and underweight in children.
- Micronutrient deficiencies ("hidden hunger"): iron, vitamin A, iodine, zinc and others; tackled by diverse diets, supplementation, fortification and biofortified crops such as orange-fleshed sweet potato and zinc-rich wheat.
- Overweight and obesity and diet-related diseases.
Many countries face a double or triple burden, with undernutrition, micronutrient deficiencies and obesity together.
Measuring food insecurity
- Prevalence of Undernourishment (PoU): FAO's estimate of the share of people whose habitual energy intake is below their needs. FAO's State of Food Security and Nutrition in the World estimated that around 9 per cent of the world's people, roughly 700 to 750 million, faced hunger in 2023.
- Food Insecurity Experience Scale (FIES): eight survey questions about people's experiences, such as skipping meals; it estimated that around 2.3 billion people were moderately or severely food insecure.
- Cost and affordability of a healthy diet: the share of people who cannot afford a healthy diet, estimated at more than a third of the world population.
- Integrated Food Security Phase Classification (IPC): rates areas from Phase 1 (minimal) to Phase 5 (catastrophe or famine) to guide emergency response.
- Food balance sheets: national accounts of food supply.
A simple food balance for cereals
A country of 50 million people has, for one year, in million tonnes of cereals:
- Production 12, imports 2, exports 1, increase in stocks 1.
- Used for animal feed, seed, industry and losses: 2.
Food available = 12 + 2 − 1 − 1 − 2 = 10 million tonnes.
- Per person per year: 10,000,000,000 kg ÷ 50,000,000 = 200 kg.
- Per person per day: 200 ÷ 365 ≈ 0.548 kg, about 548 g.
- At about 3.5 kcal per gram of cereal: 548 × 3.5 ≈ 1,920 kcal per person per day from cereals.
With an average requirement of about 2,100 to 2,400 kcal, the national average looks adequate once other foods are added. But averages hide unequal access: if the poorest fifth of the population gets far less, hunger can persist despite enough food nationally, which is exactly Sen's point.
Pathways to food security
- Raise productivity and incomes of small farmers and rural workers.
- Reduce losses after harvest and improve storage.
- Social protection: cash transfers, food rations, school meals and public works.
- Nutrition-sensitive agriculture: diverse crops, livestock, fish, home gardens and biofortified varieties.
- Stable, open markets and strategic reserves for emergencies.
- Clean water, sanitation, health care and women's education.
- Climate adaptation and conflict prevention.
Key points
- Food security: all people, at all times, have access to sufficient, safe and nutritious food (World Food Summit, 1996).
- Four pillars: availability, access, utilisation and stability; agency and sustainability proposed in 2020.
- Sen's entitlement approach: famines often reflect collapsed access, not shortages.
- Malnutrition includes undernutrition, micronutrient deficiencies and obesity.
- Measures: PoU, FIES, healthy diet affordability, IPC phases and food balance sheets.
- Food available = production + imports − exports − stock increase − non-food uses.
What the exams ask
- School-leaving and entrance papers: definition and pillars of food security, and causes of hunger.
- Degree and research-fellowship entrances: entitlement theory, chronic versus transitory insecurity, measurement methods, hidden hunger, and food balance calculations.
- Professional and policy examinations: food security programmes, public distribution and social protection, nutrition-sensitive agriculture, and early warning systems.
Described in general terms: the kind of examination, not a past paper. Laisha never reproduces exam questions.
Questions people ask
Is food security the same as self-sufficiency?
No. Self-sufficiency means producing all one's own food. A country can be food secure through trade, and a self-sufficient country can still have many hungry people if they cannot afford food.
Why does hunger persist when there is enough food?
Mainly because of poverty, inequality, conflict and poor infrastructure, which prevent people from accessing food, along with poor health and sanitation that limit how well the body uses it.
What is food sovereignty?
A concept from farmers' movements emphasising the right of peoples to define their own food and agricultural policies, often prioritising local production and small farmers.
Sources
- FAO. Rome Declaration on World Food Security and World Food Summit Plan of Action. FAO, 1996.
- FAO, IFAD, UNICEF, WFP and WHO. The State of Food Security and Nutrition in the World 2024. FAO, Rome, 2024.
- Sen, A. Poverty and Famines: An Essay on Entitlement and Deprivation. Clarendon Press, 1981.
- HLPE. Food Security and Nutrition: Building a Global Narrative towards 2030. High Level Panel of Experts report 15, Committee on World Food Security, 2020.
- IPC Global Partners. Integrated Food Security Phase Classification Technical Manual, version 3.1. IPC, 2021.
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