Poverty is the single largest driver of world hunger. In low-income economies, roughly one in three people is undernourished, compared to about one in twenty in high-income economies. That gap persists not because the world lacks food, but because hundreds of millions of people lack the money to buy it, the resources to grow it, or the resilience to withstand shocks that disrupt their food supply.
As of 2022, about 838 million people lived in extreme poverty on less than $2.15 per day. That same year, 2.83 billion people, roughly 35 percent of the global population, could not afford a healthy diet. These two numbers are deeply intertwined, and the relationship between them runs in both directions: poverty causes hunger, and hunger deepens poverty.
Why the Poorest Spend the Most on Food
The most immediate way poverty drives hunger is simple arithmetic. Poor households spend a vastly larger share of their income on food than wealthier ones. In the United States, households in the lowest income bracket spend about 33 percent of their after-tax income on food, while the highest earners spend around 8 percent. In low-income countries, that gap is even more extreme, with the poorest families sometimes spending 60 to 70 percent of their earnings just to eat.
This means any disruption, a small rise in food prices, a medical bill, a missed day of work, can immediately translate into skipped meals. Wealthier households absorb these shocks without changing what they eat. Poor households cannot. When food prices climb, they shift to cheaper, less nutritious options or simply eat less. The margin between getting by and going hungry is razor-thin.
The Low-Input Trap for Small Farmers
About two billion people worldwide depend on smallholder farming for their livelihoods. Paradoxically, many of the world’s hungriest people are farmers themselves. The reason is a cycle researchers call the “low-input, low-output” system. Farmers who lack cash, savings, or access to credit cannot afford improved seeds, fertilizer, or basic pest control. Without those inputs, their yields stay low. Low yields mean low income, which means they still cannot afford inputs the following season.
Several barriers keep this cycle locked in place. Financial investments in better farming practices require upfront money that poor farmers simply do not have. Even when inputs are theoretically available, failing local markets mean seeds or fertilizer may not be in stock when planting season arrives. And because the future benefits of investing in a farm are never guaranteed, especially under increasingly unpredictable weather, many farmers are understandably reluctant to risk what little money they have. Without the possibility to invest in improving profitability, income cannot increase. The result is that millions of farming families grow food for a living yet remain chronically food insecure.
Climate Shocks Hit the Poorest Hardest
Climate change is intensifying hunger worldwide, but its burden falls disproportionately on people already living in poverty. The IPCC has stated with high confidence that climate change increases the threat of poverty traps and food insecurity, and that poor communities are significantly less resilient to climate impacts.
The mechanics are straightforward. A drought or flood destroys a season’s crops. A wealthier farmer may have irrigation, crop insurance, or savings to fall back on. A poor farmer has none of these. Lost agricultural income is one of the key factors driving disproportionate climate impacts among poor households globally. Beyond direct crop losses, climate change raises the cost of food, housing, and healthcare, costs that consume a larger share of poor households’ budgets. Each climate shock can push families deeper into poverty, making them more vulnerable to the next one.
Urban Hunger Is Growing Fast
Hunger is no longer primarily a rural problem. Over 75 percent of the world’s food-insecure population now lives in urban and peri-urban areas, totaling roughly 1.7 billion people. While rural areas still have higher rates of food insecurity relative to their population size, the sheer number of hungry people in cities has grown dramatically as urbanization accelerates.
Urban poverty creates a distinct kind of food vulnerability. Unlike rural families who may grow some of their own food, city dwellers rely almost entirely on markets. That means they need cash for every meal. When income drops due to job loss, illness, or economic downturns, there is no garden to fall back on. The COVID-19 pandemic illustrated this sharply: urban food insecurity spiked as people lost livelihoods, school meal programs shut down, and caregiving responsibilities increased, all at once.
Women Bear a Disproportionate Burden
Gender is one of the strongest predictors of who goes hungry within poor communities. Female-headed households are 75 percent more likely to be food insecure than male-headed households. Women make up an estimated 70 percent of the world’s poorest people, a pattern sometimes called the feminization of poverty.
This disparity stems from compounding disadvantages. Women in low-income settings often have less access to land ownership, credit, education, and paid employment. In many regions, cultural norms mean women and girls eat last and least within their own households. When poverty tightens a family’s food budget, these existing inequalities determine who absorbs the shortage first.
How Hunger in Childhood Locks In Poverty
Perhaps the most damaging aspect of the poverty-hunger connection is how it perpetuates itself across generations. When children are malnourished during their first few years of life, the effects extend far beyond an empty stomach. Poverty-related differences in brain development, particularly in regions responsible for planning, decision-making, and self-control, account for 15 to 20 percent of the achievement gap between low-income and higher-income children.
The pathway works through biology. Chronic stress from poverty and food scarcity elevates stress hormones in both parents and children. In caregivers, this persistent stress can reduce the quality of parenting, not through any fault of character, but through the sheer cognitive load of survival. Children raised under these conditions show elevated stress hormones and weaker development of the mental skills needed for learning, emotional regulation, and long-term planning. These same skills are among the strongest predictors of health, earnings, and overall wellbeing in adulthood.
A malnourished child who falls behind in school is more likely to earn less as an adult, more likely to remain in poverty, and more likely to raise children who face the same disadvantages. This is how hunger and poverty become self-reinforcing across generations, not just at the household level but at the national level. Countries with high rates of childhood stunting carry the economic costs for decades in reduced workforce productivity.
Why Progress Has Stalled
Global undernourishment declined steadily from 13 percent of the world’s population in 2000 to about 8.3 percent by 2015. Then it reversed. By 2020, the rate had climbed back to 9.9 percent, driven by overlapping crises: conflict, climate extremes, and economic downturns from the pandemic. The UN’s goal of reaching zero hunger by 2030 is now widely acknowledged to be off track.
In low-income economies, the picture is especially bleak. Undernourishment rates rose from about 25 percent in 2000 to over 33 percent by 2020. Rather than narrowing, the gap between the world’s poorest and wealthiest countries has widened. Each new crisis, whether a war, a pandemic, or a failed harvest, compounds the damage of the last, and the poorest communities absorb the worst of it every time.