Food Safety Hazards
According to the World Health Organization (WHO), an estimated 600 million people fall ill every year after consuming contaminated food, and 420,000 lose their lives as result. Low- and middle-income countries also face an economic burden of around USD 110 billion annually in lost productivity and healthcare costs, alongside significant repercussions for tourism and international trade.
In the high-income regions, the picture is similarly concerning. The US Centers for Disease Control and Prevention (CDC) reports that foodborne diseases affect roughly one in six Americans each year – an estimated 48 million people – leading to 128, 000 hospitalisations and 3,000 deaths.
With such far-reaching health and economic impacts, understanding food safety hazards and how to manage them throughout the food value chain is crucial for ensuring the safety of food products everywhere.
What is a food hazard: a definition
A food hazard is any biological, chemical, or physical agent that has the potential to cause illness or injury if not properly controlled. These hazards can arise at any point in the food production process, from sourcing and processing through to distribution, preparation, and consumption.
Types of food hazards
Food hazards include a wide range of risks that can compromise the safety and quality of food products. They are commonly classified into biological, chemical, and physical categories. Each requires targeted monitoring and specific control measures to ensure food safety.
Below are the main hazard types and examples of how they may occur.
Biological & Macrobiological Hazards
Biological hazards in the food industry include microorganisms and pathogens such as bacteria, viruses, parasites, and fungi that can cause foodborne illnesses. Well-known examples include Norovirus, Salmonella, E. coli, and Listeria but there are at least 31 recognised pathogens – and likely more yet to be identified.
Leafy vegetables, particularly those consumed raw in pre-packed salads, are frequently associated with outbreaks of Salmonella, E. coli, or Listeria. Contamination often stems from poor hygiene practices during processing, handling or preparation.
Norovirus outbreaks are commonly reported in the cruise ship and catering sectors. Although Norovirus can be spread through several routes, the majority of food-related cases are linked to inadequate staff hygiene in food preparation areas. Hepatitis A is another example of a virus that can cause long-lasting liver disease. It is typically transmitted through raw or undercooked seafood or via contaminated fresh produce.
Food Chemical Hazards
Chemical hazards in food refer to harmful substances that unintentionally contaminate food. Chemical food hazard examples include pesticides, food additives, allergens, cleaning agents, and toxins. Chemical contamination often results from residues of cleaning products, the use of unsafe plastics, pest control chemicals, or poorly managed equipment maintenance. These substances can be introduced at multiple points throughout the production environment if controls are not rigorously applied.
Physical Hazards in Food
Physical hazards refer to foreign objects that may enter food products and present risk of injury to the consumer. Examples of food physical hazards include glass, metal fragments, and plastic pieces. These contaminants may be present in raw materials due to machinery wear and tear or be introduced inadvertently by personnel working on the production line.
Food safety risk analysis: how to identify food hazards
Food safety risk analysis involves risk assessment, risk management (including the application of HACCP) and risk communication. These activities are largely carried out by public authorities and international organisations, whose evaluations provide an essential foundation for the food industry’s own hazard assessments.
For individual businesses, food safety standards provide a structured framework for identifying, assessing, and controlling potential hazards. Implementing a food safety management system (FSMS) offers an organised and systematic approach that helps companies recognise specific risks and put effective controls in place to manage them.
Food safety hazard management: how to prevent food hazards
All recognised standards used to implement a Food Safety Management System (FSMS) emphasise that preventing food hazards requires a comprehensive, integrated approach. This includes establishing prerequisite programmes (PRPs) such as Good Hygiene Practice (GHP), developing detailed Hazard Analysis and Critical Control Point (HACCP) plans, and ensuring that all personnel involved in food production receive appropriate training and education. Ongoing monitoring, verification, and continual improvement are essential to keep food safety measures current with emerging risks and evolving regulatory requirements.
Organisations that adopt an FSMS often seek independent third‑party certification, for example from a certification body such as DNV, to demonstrate that their system meets the relevant standard or benchmark. During the planning stage of the Plan–Do–Check–Act (PDCA cycle) the organisation identifies likely critical control points (CCPs). Additional CCPs may be identified later during the checking stage, and these must be incorporated into the FSMS as part of continual improvement.
Although an FSMS is sometimes viewed as purely technical, a good food safety culture is a vital component. This culture is strengthened by involving staff in the planning and development of the FSMS and by highlighting the crucial role of human behaviour in preventing food safety risks.
The significance of food safety culture is highlighted in the Codex Alimentarius, which states: “Fundamental to the successful functioning of any food hygiene system is the establishment and maintenance of a positive food safety culture acknowledging the importance of human behaviour in providing safe and suitable food.” This emphasis is echoed in legislation such as EU Regulation 382/2021, which requires that “Food business operators shall establish, maintain and provide evidence of an appropriate food safety culture.”
