The World Health Organization (WHO) has released updated estimates revealing that more than 866 million people fell ill and 1.52 million died from foodborne diseases in 2021. This stark assessment underscores the persistent global threat posed by contaminated food.
Global Burden of Foodborne Diseases
The WHO analysis examined 42 infectious and chemical foodborne hazards across countries and regions. It found that unsafe food was responsible for 57.1 million disability-adjusted life years (DALYs), a metric that combines years lost due to illness, disability, and premature death. The burden was highest in Africa and South-East Asia.
Major Public Health Challenge
Foodborne diseases remain a major public health issue globally, despite an overall decline in burden since 2000. Researchers note that the scale of the problem is comparable to that of tuberculosis, HIV/AIDS, and malaria, highlighting the continuing health and economic costs of unsafe food.
Chemical Contaminants and Deaths
While foodborne illnesses are often associated with infections, chemical contaminants accounted for a disproportionate share of deaths. Inorganic arsenic and lead were leading contributors to the overall burden, alongside non-typhoidal Salmonella. Chemical hazards were linked to nearly three-quarters of all deaths from contaminated food, despite causing only a small fraction of total illnesses.
Children at Higher Risk
Children under five years old bore a particularly heavy burden. The incidence of foodborne illness in this age group was 2.7 times higher than in older age groups, and their rate of health loss (measured through DALYs) was 4.3 times greater. These findings emphasize the vulnerability of young children to contaminated food and its long-term consequences.
Regional Disparities
Researchers estimated that the 42 hazards caused 866 million foodborne illnesses in 2021. Diarrheal diseases accounted for the largest share, followed by invasive enteric and parasitic diseases. The study found major inequalities between regions, with the highest rates of illness and disease burden concentrated in parts of sub-Saharan Africa, the Horn of Africa, and South-East Asia.
Economic Impact
Beyond health, unsafe food carries substantial economic costs. Productivity losses linked to foodborne disease were estimated at $310 billion in nominal terms in 2021, rising to $647 billion after adjusting for purchasing power parity. Although the overall burden has declined over the past two decades, significant disparities remain across regions and populations. The findings point to the ongoing challenge of ensuring safe food supplies and reducing exposure to both infectious and chemical hazards worldwide.
