Food Security, Malnutrition, and Global Food Distribution
Food security exists when all people at all times have physical and economic access to sufficient, safe and nutritious food that meets their needs for an active and healthy life; malnutrition is a lack, excess or imbalance of nutrients and energy in a person’s diet, and global food distribution describes how food is produced, traded and shared between regions. In brief: the world produces enough calories to feed everyone, but hunger persists because of poverty, conflict, inequality, weak infrastructure and food waste, and not mainly because of shortage in total. Malnutrition includes undernutrition (stunting, wasting), hidden hunger from missing vitamins and minerals, and overnutrition (overweight and obesity).
Hunger and obesity can exist in the same country and even in the same household, which shows that food security is about access and quality as well as quantity. This guide explains the dimensions of food security, the forms and causes of malnutrition, the pattern of global food distribution, compares the forms of malnutrition in a table, works through calculations, outlines the history and corrects common mistakes.
What is food security?
The Food and Agriculture Organization (FAO) describes four dimensions of food security.
- Availability: enough food is produced, stored or imported.
- Access: people can afford it or grow it, and can reach markets. Poverty is the main barrier.
- Utilization: food is safe, nutritious and properly used by the body, which requires clean water, sanitation and health care.
- Stability: the other three are reliable over time, despite shocks such as drought, price rises, conflict or the economic crisis.
Food insecurity ranges from mild (uncertainty about getting food) to severe (going a day without eating). Famine is the most extreme form, declared when a region meets specific levels of hunger, malnutrition and deaths. FAO reports that several hundred million people, in the range of 700 to 800 million in recent years, face chronic hunger, mostly in Sub-Saharan Africa and South Asia.
What is malnutrition?
Undernutrition includes stunting (low height for age, a sign of chronic undernutrition in childhood), wasting (low weight for height, a sign of acute shortage of food or illness) and underweight. It harms physical and mental development and raises the risk of death from infections. Micronutrient deficiency (“hidden hunger”) is a lack of vitamins and minerals such as iron (anemia), vitamin A (blindness and infection risk) and iodine (thyroid problems). Overnutrition means eating too much energy or unbalanced diets, leading to overweight, obesity and diseases such as type 2 diabetes and heart disease, which are increasing rapidly in both rich and poor countries. This “double burden” of malnutrition is increasingly common.
The main causes are poverty, lack of education, poor health and sanitation, conflict, climate shocks and unaffordable healthy food. Body mass index (BMI = weight in kg ÷ height in m squared) is used to classify adults: below 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight and 30 and above is obese.
How is food distributed globally?
World food production is unevenly spread. Large producers and exporters of cereals include the United States, Brazil, Argentina, Russia, Ukraine, Canada, Australia and France, while many countries in Africa and the Middle East import much of their food. Trade, aid and stockpiles move food, but low incomes and poor transport and storage limit access in many poor regions. Around one third of food produced for people is lost or wasted according to FAO estimates: in poorer countries, mostly after harvest because of weak storage and roads, and in richer countries mostly by retailers and households. Rich countries on average consume more calories and meat per person than poorer countries. Food prices are also affected by oil prices, biofuels, export bans, speculation and wars, such as the shock to grain and fertilizer markets after 2022.
What can improve food security?
- Raising productivity of small farmers: better seeds, irrigation, storage, advice and access to markets and credit.
- Reducing waste: cold storage, better roads and packaging, and changes in retail and household habits.
- Social protection: cash transfers, school meals and food aid for the vulnerable.
- Nutrition programs: breastfeeding support, fortified foods, vitamin supplements and nutrition education.
- Peace and stable policies: avoiding conflict, and fair trade rules and food reserves.
- Climate adaptation: drought-tolerant crops and water management.
Forms of malnutrition compared
| Form | Meaning | Typical consequence |
|---|---|---|
| Stunting | Low height for age | Poor growth, weaker learning |
| Wasting | Low weight for height | High risk of death |
| Micronutrient deficiency | Lack of vitamins or minerals | Anemia, blindness, thyroid disease |
| Overweight and obesity | Excess weight from imbalanced diet | Diabetes, heart disease |
Worked example: calories, shortfall and waste
The numbers are hypothetical, to show the method.
- Calorie supply: a country has a food supply of 2,000 kcal per person per day, and the average need is about 2,300 kcal. The shortfall is 2,300 − 2,000 = 300 kcal, which is 300 ÷ 2,300 = 13%.
- Total national need: for 40 million people, the daily need is 40,000,000 × 2,300 = 92,000,000,000 kcal, or 92 billion kcal.
- Prevalence of hunger: if 6.4 million of 40 million people are undernourished, the prevalence is 6.4 ÷ 40 = 16%.
- Food waste: if a country produces 30 million tonnes of food and loses a third, the loss is 30 ÷ 3 = 10 million tonnes. If post-harvest losses fall by a quarter, 2.5 million tonnes are saved.
- BMI: a woman weighing 52 kg with a height of 1.60 m has a BMI of 52 ÷ (1.60 × 1.60) = 52 ÷ 2.56 = 20.3, which is in the normal range. A man of 95 kg and 1.75 m has 95 ÷ 3.0625 = 31.0, which is classed as obese.
- Stunting: if 120 of 500 children measured are stunted, the stunting rate is 120 ÷ 500 = 24%.
How have food crises and responses developed?
Famines have occurred throughout history, for example the Irish Famine of the 1840s and the Bengal famine of 1943. The economist Amartya Sen argued in the 1980s that famines are often caused by failures of access (entitlements) and not only by a lack of food, and that democracies with a free press rarely experience them. The FAO was founded in 1945, and the World Food Summit of 1996 formulated the definition of food security used today. The first Millennium Development Goal aimed to halve hunger by 2015, and the Sustainable Development Goals aim to end hunger by 2030 (SDG 2), a target that the world is not on track to meet. Crises in food prices in 2007–08 and after 2020 renewed attention to the fragility of the food system.
Which mistakes are common?
Mistake 1: Believing that hunger is mainly caused by too little food in the world
Total production is enough. Poverty, conflict, weak distribution and waste are the main causes.
Mistake 2: Equating malnutrition with starvation
Malnutrition also includes vitamin and mineral deficiencies and overweight. People can be overweight and still lack key nutrients.
Mistake 3: Treating food security as only about calories
Quality, safety, stability and access matter as well as the total energy available.
Mistake 4: Thinking that food aid is a lasting solution
Aid helps in emergencies, but long-term security needs higher incomes, better farming and stable institutions.