Food security exists when people have reliable physical and economic access to sufficient, safe and nutritious food that meets their dietary needs and food preferences for an active and healthy life. FAO identifies four interconnected dimensions or pillars of food security: availability, access, utilisation and stability. Food security is therefore broader than simply having enough food produced nationally.
A country can have abundant food supplies while some households remain food insecure because they lack income, physical access, secure livelihoods or adequate services. Similarly, a household can have access to calories but still experience poor food security if its diet lacks essential nutrients or if water, sanitation and health conditions prevent effective utilisation of nutrients.
Food availability refers to whether sufficient quantities of appropriate food exist through domestic production, imports, stocks and other sources. Agricultural production is one major component, but food availability also depends on fisheries, livestock, food processing, storage, transport and international trade. A country that produces little of a particular food can still have high availability if it can reliably import it. Conversely, a country with large agricultural output can experience local shortages if roads, markets or distribution systems fail. Availability therefore has spatial and temporal dimensions, because food needs to exist in the right places and at the right times rather than merely somewhere within a national territory.
Food access refers to whether individuals and households can obtain appropriate food through purchasing, producing, receiving transfers or using other legitimate means. Economic access depends heavily on income, employment, food prices, assets and purchasing power. Physical access depends on roads, markets, transport, distance and security. Poverty is therefore a major structural cause of food insecurity because food may exist in markets while households lack sufficient resources to obtain it. Food access can also be affected by discrimination, displacement, disability, social exclusion and conflict. The concept of access explains why hunger cannot be understood solely as a problem of agricultural production.
Food utilisation concerns how the body uses food and therefore includes dietary quality, preparation, food safety, clean drinking water, sanitation, healthcare and nutritional status. A household can possess enough calories while children remain malnourished if diets lack protein or micronutrients, or if repeated infections impair nutrient absorption. Safe preparation and storage are also important because contaminated food can cause illness and reduce nutritional wellbeing. FAO has emphasised that utilisation involves adequate diet as well as non food factors such as clean water, sanitation and health care. Food security is therefore closely connected to public health and nutrition.
Stability means that the other dimensions of food security should remain secure over time rather than being available only temporarily. A household may have sufficient food today but be food insecure if it faces a high risk of losing access because of drought, conflict, unemployment, price shocks, illness or displacement. Stability can operate over seasons, years or longer periods. Agricultural systems therefore require resilience to weather variability, market disruptions and other shocks. FAO describes stability as a cross cutting dimension that interacts with availability, access and utilisation rather than functioning as a completely separate stage.
Food security exists at several scales, including individual, household, community, national, regional and global levels. National food self sufficiency and food security are not synonymous. A country can import substantial quantities of food and still maintain high food security if households have reliable purchasing power and supply chains are stable. Conversely, a country can produce most of its own food while particular populations remain unable to afford or physically access it. Food security indicators therefore examine food consumption, dietary diversity, undernourishment, income, food prices, coping strategies and other dimensions rather than relying on agricultural production alone.
Food security is influenced by agriculture, economics, public health, infrastructure, trade, governance, climate, conflict and environmental sustainability. Sustainable food systems are important because food security must be maintained without degrading the resources required for future production. FAO states that sustainable food and agriculture contributes to all four pillars of food security while also addressing environmental, social and economic sustainability. Measures that can improve food security include improving agricultural productivity, reducing food losses, strengthening markets, protecting livelihoods, supporting social protection, improving water and sanitation, diversifying diets and building resilience to shocks.
Food security should not be confused with food abundance, food self sufficiency or the absence of famine. Food abundance describes the quantity of food available, while food security includes access, utilisation and stability. Food self sufficiency describes the extent to which a country meets its food needs through domestic production and does not necessarily measure whether households can afford or access food.
Famine is an extreme area level crisis involving starvation, acute malnutrition and deaths, whereas food insecurity can range from mild or moderate limitations in food access to catastrophic conditions. The modern concept of food security therefore provides a broad framework for understanding whether people can consistently obtain and benefit from adequate food.
