From bacteria to chemicals, contaminated food threatens public health and costs billions while killing hundreds of thousands each year worldwide
Every year, approximately 600 million people around the world become sick after eating contaminated food. That’s nearly 1 in 10 people globally. Even more alarming is that 420,000 of those cases result in death. This staggering public health crisis costs low and middle income countries an estimated $110 billion annually in lost productivity and medical expenses.
Food safety, nutrition, and food security exist as interconnected pillars of public health. When unsafe food containing harmful bacteria, viruses, parasites, or chemical substances enters the body, it can cause more than 200 different diseases. These range from relatively mild cases of diarrhea to severe conditions like cancer.
The burden falls heaviest on the most vulnerable populations. Children under 5 years old carry 40% of the foodborne disease burden, with 125,000 deaths occurring in this age group each year. The impact extends beyond individual health, impeding socioeconomic development by straining healthcare systems and damaging national economies, tourism, and trade.
Common culprits behind foodborne illness
Bacterial infections account for many foodborne illnesses. Salmonella, Campylobacter, and enterohaemorrhagic Escherichia coli affect millions annually, sometimes with fatal outcomes. Symptoms typically include fever, headache, nausea, vomiting, abdominal pain, and diarrhea. Eggs, poultry, raw milk, undercooked meat, and contaminated fresh produce frequently serve as vehicles for these pathogens.
Listeria poses particular dangers for pregnant women, potentially causing miscarriages or newborn deaths. This bacteria thrives in unpasteurized dairy products and ready to eat foods, continuing to grow even at refrigeration temperatures. Vibrio cholerae spreads through contaminated water or food, causing severe dehydration through profuse watery diarrhea that can quickly become life threatening.
The overuse of antimicrobials in veterinary and human medicine has created another challenge. Resistant bacteria now render some treatments ineffective, making infections harder to combat in both animals and humans.
Viruses and parasites in the food chain
Norovirus commonly causes foodborne infections characterized by explosive vomiting, watery diarrhea, and abdominal pain. Hepatitis A virus can trigger long lasting liver disease and typically spreads through raw or undercooked seafood and contaminated raw produce.
Various parasites enter the food chain through different routes. Fish borne trematodes transmit exclusively through food, while tapeworms may infect people through food or direct animal contact. Other parasites like Ascaris, Cryptosporidium, and Giardia contaminate fresh produce through water or soil.
Chemical and environmental hazards
Naturally occurring toxins present significant health risks. Mycotoxins like aflatoxin and ochratoxin grow on grain and can accumulate in staple foods like corn and cereals. Long term exposure affects the immune system, disrupts normal development, and can cause cancer.
Persistent organic pollutants accumulate in the environment and human body. Dioxins and polychlorinated biphenyls result from industrial processes and waste incineration. These highly toxic compounds cause reproductive and developmental problems, damage the immune system, interfere with hormones, and increase cancer risk.
Heavy metals including lead, cadmium, and mercury cause neurological and kidney damage. These contaminants enter food mainly through pollution of water and soil.
A growing global challenge
Urbanization and changing consumer habits have increased the number of people eating food prepared in public places. Globalization has created longer, more complex food chains to meet demand for diverse products. Climate change threatens to worsen food safety through extreme weather events, temperature increases, and changing precipitation patterns.
These evolving challenges require coordinated response. Governments must develop evidence based policies and effective food safety systems. Food handlers and consumers need education on safe practices. The responsibility spans from farm to fork, requiring collaboration between governments, food producers, and consumers to ensure safer food systems for everyone.
Source: WHO