Food security is a problem because a web of interconnected forces, from armed conflict and climate extremes to economic inequality and broken supply chains, prevents hundreds of millions of people from reliably getting enough nutritious food. As of 2024, roughly 673 million people worldwide experienced chronic hunger, representing about 8.2 percent of the global population. That number has improved slightly from recent peaks, but it remains tens of millions higher than pre-pandemic levels, and the causes behind it are growing more complex.
What Food Security Actually Means
Food security isn’t just about whether enough food exists. It rests on four pillars: availability (is there enough food being produced?), access (can people afford it and physically get it?), utilization (does the food meet nutritional needs, and can people’s bodies absorb those nutrients?), and stability (are all three of those consistent over time, or do they collapse during a crisis?). A country can produce surplus grain and still have millions of food-insecure citizens if those people can’t afford to buy it or live too far from functioning markets. That distinction is central to understanding why this problem persists even though the world technically grows enough calories to feed everyone.
Conflict Disrupts Every Part of the Food System
Armed conflict is one of the most reliable predictors of hunger. Wars destroy farmland, displace farmers, cut off trade routes, and divert government resources away from agriculture and social safety nets. In 2013, approximately 167 million undernourished people lived in countries experiencing protracted crisis, about 21 percent of the world’s total undernourished population at the time. That share has only grown as conflicts in places like Sudan, Yemen, and parts of sub-Saharan Africa have intensified or dragged on for years.
Conflict doesn’t just reduce food production locally. It sends shockwaves through global markets. When Russia invaded Ukraine in 2022, attacks on the port of Odessa and sanctions on Russian vessels disrupted shipping across the Black Sea, a critical corridor for wheat and fertilizer exports. Freight rates spiked, services were suspended, and importers were forced onto longer, costlier routes. The ripple effects raised bread prices in countries thousands of miles from the fighting.
Food Costs Hit Low-Income Countries Hardest
The economics of food insecurity come down to a simple disparity: the poorer a household is, the larger the share of income it spends on food. The average American household spends about 7.6 percent of its budget on groceries. In countries like Mexico, Ukraine, and Indonesia, that figure exceeds 40 percent. When global food prices spike, wealthier populations absorb the increase with minor lifestyle adjustments. For families already spending nearly half their income on food, even a modest price hike can mean skipping meals or switching to cheaper, less nutritious options.
Recent years have tested this vulnerability repeatedly. Fertilizer prices jumped 80 percent in 2021, then climbed another 30 percent by early 2022, driven largely by surging natural gas costs. Since natural gas is a key input in fertilizer manufacturing, those increases raised production costs for farmers worldwide, which translated directly into higher prices at markets and grocery stores. For the billions of people living on a few dollars a day, these price shocks can push a family from food-secure to food-insecure in a matter of weeks.
Supply Chains Are More Fragile Than They Appear
The modern food system depends on a remarkably small number of chokepoints. A handful of shipping corridors, including the Black Sea, the Suez Canal, and the Strait of Hormuz, carry an outsized share of the world’s grain, oil, and fertilizer. When any of these routes is disrupted, the consequences cascade quickly.
Starting in November 2023, Houthi forces intensified attacks on commercial vessels near the Red Sea, forcing ships bound for the Suez Canal to reroute around the southern tip of Africa. That detour added weeks to delivery times, raised fuel costs, and created backlogs at ports far from the conflict zone. Meanwhile, the war in Ukraine continued to restrict Black Sea shipping, making imports of wheat, oil, gas, and fertilizers scarce and expensive for European and Asian markets. Domestic food production slowed in both the EU and China as record-high natural gas prices made fertilizer prohibitively costly for many farmers.
These disruptions don’t resolve neatly. Higher freight costs ripple through every stage of the supply chain, raising prices for processors, distributors, retailers, and ultimately consumers. Product quality also suffers when perishable goods spend extra weeks in transit.
One-Third of All Food Never Gets Eaten
Perhaps the most frustrating dimension of food insecurity is waste. Each year, roughly one-third of all food produced for human consumption is lost or wasted. About 13 percent is lost after harvest but before it reaches store shelves, often due to inadequate storage, poor roads, or lack of refrigeration in developing regions. Another 19 percent is wasted in homes, supermarkets, and restaurants, primarily in wealthier countries where consumers discard food that’s past its sell-by date or simply buy more than they can eat.
This means the planet already produces more than enough food. The problem is that vast quantities never reach the people who need it most. Reducing post-harvest losses in sub-Saharan Africa or South Asia, where storage infrastructure is weakest, could feed millions without planting a single additional acre.
The Health Toll on Children
Food insecurity doesn’t just mean empty stomachs. It reshapes bodies and brains, especially in young children. In 2024, an estimated 150.2 million children under five were stunted, meaning they were too short for their age due to chronic malnutrition. That’s 23.2 percent of all children in that age group worldwide. Another 42.8 million were wasted (too thin for their height), with 12.2 million of those cases classified as severe.
Stunting isn’t just a matter of height. Children who don’t get adequate nutrition during their first few years experience lasting changes in brain development, immune function, and metabolic health. They score lower on cognitive tests, earn less as adults, and are more susceptible to chronic diseases later in life. The damage is largely irreversible after age two, which makes early childhood malnutrition one of the most consequential public health failures in the world.
The Economic Cost of Doing Nothing
Malnutrition doesn’t just harm individuals. It drags down entire economies. Preventable undernutrition costs the global economy at least $761 billion per year, roughly 1 percent of total global national income. That works out to about $2.1 billion every day.
Childhood stunting alone accounts for $548 billion annually in lost economic potential, through lower productivity, reduced earnings, and higher healthcare costs over a lifetime. Suboptimal breastfeeding adds another $507 billion. Low birth weight, often a consequence of maternal malnutrition, costs $344 billion. Anemia in children reduces future productivity by an estimated $161 billion per year, while anemia in women of reproductive age costs $113 billion in current income losses. These figures overlap somewhat, but even after adjusting for that, the scale is staggering. Every dollar not spent on preventing malnutrition shows up later as lost wages, lower tax revenue, and higher medical bills.
Why the Problem Keeps Getting Harder
What makes food insecurity so persistent is that its causes reinforce each other. Conflict displaces farmers, which reduces local food production, which raises prices, which pushes vulnerable families into malnutrition, which weakens the workforce, which slows economic recovery, which makes the region more susceptible to future conflict. Climate shocks follow a similar pattern: droughts or floods destroy a season’s harvest, farmers take on debt, input costs rise, and the next growing season starts from a weaker position.
These feedback loops explain why global hunger declined steadily for decades but has plateaued or worsened in recent years. Progress in some regions, particularly parts of Asia and Latin America, has been offset by deteriorating conditions in Africa and Western Asia, where conflict, climate vulnerability, and economic fragility overlap most intensely. The 673 million people facing hunger in 2024 represent a slight improvement from 2022 and 2023, but the trajectory remains far off course from global targets to eliminate hunger.