Food loss and food waste both describe food that never gets eaten, but they happen at different points in the journey from farm to fork. Food loss occurs early in the supply chain, during harvesting, storage, processing, and transportation. Food waste happens later, at the retail and consumer level, when edible food is discarded by stores, restaurants, or households. Together, they account for roughly 1.3 billion tons of food per year, about one-third of everything produced for human consumption globally.
Where Each One Happens
The food supply chain has five broad stages: production, handling and storage, processing and packaging, distribution and marketing, and consumption. According to the FAO framework, food loss covers the first three stages. Food that spoils in a warehouse, gets damaged during transport, or is discarded during processing all counts as food loss. Food waste covers the final stages: food thrown out by grocery stores, restaurants, and people at home.
This distinction matters because the causes, and therefore the solutions, are completely different for each category.
What Causes Food Loss
Food loss is largely an infrastructure and technology problem. In many regions, poor harvesting techniques damage crops before they even leave the field. Inadequate storage facilities expose grain, fruit, and vegetables to heat, moisture, pests, and mold. Limited access to refrigerated transport means perishable items spoil on the way to processing plants or markets.
Low investment in agricultural technology and infrastructure is a major driver. Farmers without access to proper drying equipment, cold storage, or reliable roads lose a significant share of their harvest before it reaches a buyer. These losses hit hardest in lower-income countries where supply chain infrastructure is least developed, meaning that food is lost not because anyone chose to discard it, but because the systems to preserve it simply don’t exist.
What Causes Food Waste
Food waste is driven more by behavior, business practices, and cultural norms. At the retail level, stores reject produce that doesn’t meet cosmetic standards, overstock shelves to appear abundant, and pull items before they’re actually unsafe to eat. Confusing date labels (“sell by,” “best by,” “use by”) lead both retailers and shoppers to throw away food that’s still perfectly edible.
At home, the picture is familiar to most people. Research from the World Resources Institute found that the leading drivers of household food waste in the United States include forgetting about food or losing track of it, not knowing what to do with leftovers or odd ingredients, cooking too much, and simply being too busy to use what’s been purchased before it goes bad. These aren’t failures of infrastructure. They’re patterns of daily life that add up to enormous volumes of discarded food.
The Combined Cost
The economic toll of food loss and waste together is estimated at around $1 trillion per year globally. The environmental cost is equally staggering: food loss and waste account for 8 to 10 percent of annual global greenhouse gas emissions. That includes the energy, water, and land used to produce food that nobody eats, plus the methane released when discarded food decomposes in landfills.
To put that in perspective, if food loss and waste were a country, it would be one of the world’s largest emitters of greenhouse gases.
Why the Distinction Shapes Solutions
Because food loss and food waste have different root causes, they require different interventions. Reducing food loss is primarily about investing in better infrastructure: improved storage facilities, cold chain technology that keeps perishable items refrigerated from farm to market, better roads, and training farmers in post-harvest handling techniques. These are systemic investments that governments and development organizations typically lead.
Reducing food waste, on the other hand, targets behavior and policy at the retail and consumer end. Some of the most promising approaches include simplifying date labels so shoppers can distinguish safety dates from quality dates, improving refrigerator design to keep food visible and at peak quality longer, and helping households plan meals and manage their groceries more effectively. One study found that simply removing date labels from products, forcing people to evaluate freshness on their own, led to a significant reduction in waste.
Extending the window during which food stays at peak quality is useful across the entire supply chain, but it’s especially powerful for consumers, who often waste food not because it’s spoiled but because their plans changed and they didn’t get around to cooking it when they intended to.
The Global Target for 2030
The United Nations treats food loss and food waste as related but separate challenges, even within the same policy goal. UN Sustainable Development Goal 12.3 calls on the world to halve per capita food waste at the retail and consumer levels by 2030, while also reducing food losses along production and supply chains, including post-harvest losses. The language is intentional: it sets a specific, measurable target for waste (cut it in half) while calling for broader reductions in loss, reflecting the reality that loss is harder to quantify and varies enormously by region and crop.
Progress toward this goal has been slow. Tracking food loss is inherently difficult because it happens across dispersed farms, warehouses, and transport routes in every country. Food waste is somewhat easier to measure at the retail and household level, but comprehensive national data is still limited in many parts of the world.