Fish, particularly freshwater varieties, and shellfish are the leading sources of per- and polyfluoroalkyl substances (PFAS)—synthetic chemicals that accumulate in the body and have been linked to serious health concerns. A comprehensive review of PFAS in foods reveals that these "forever chemicals" frequently exceed European safety thresholds in seafood, with other animal products like eggs and milk also contributing significantly to dietary exposure.

What Are PFAS and Why Should You Care?

PFAS are human-made chemicals used in countless industrial and consumer products, from non-stick cookware to water-resistant textiles. The problem: they don't break down naturally in the environment or in your body, earning them the nickname "forever chemicals." Once ingested, they accumulate over time and have been associated with various health risks, making food safety a critical concern for anyone eating seafood regularly.

The challenge for food safety regulators is that PFAS contamination isn't always obvious. Unlike bacterial outbreaks that trigger immediate recalls, PFAS exposure happens silently through everyday food choices. The chemicals enter waterways and soil, then accumulate in fish and shellfish—and eventually in your meals.

Which Foods Pose the Highest Risk?

The research identifies specific food categories where PFAS levels are most concerning. Understanding where these chemicals concentrate can help you make more informed dietary choices:

• Freshwater Fish: Among the highest PFAS concentrations, particularly in fish from contaminated waterways near industrial sites or areas with heavy pesticide use.
• Shellfish: Oysters, clams, and other shellfish filter large volumes of water and accumulate PFAS at levels frequently exceeding European safety thresholds.
• Eggs and Milk: Animal products from livestock and poultry fed contaminated feed or raised in areas with PFAS-contaminated water also contribute meaningfully to dietary exposure.
• Plant-Based Foods Near Industrial Sites: Vegetables and crops grown in soil or irrigated with water containing PFAS can absorb these chemicals, particularly in regions near manufacturing facilities.

The geographic factor matters too. Foods produced in areas with industrial activity or historical pesticide contamination tend to have higher PFAS levels than those from less-affected regions.

How Does PFAS Exposure Compare Across Different Foods?

While fish and shellfish are the primary dietary sources, the exposure pathway is more complex than simply avoiding seafood. The review found that animal-based foods collectively represent a significant portion of dietary PFAS intake. This means that even if you reduce fish consumption, exposure through eggs, dairy, and meat from animals fed contaminated feed or raised in affected areas can still accumulate over time.

The European Union has established safety thresholds for PFAS in foods, and research shows that seafood frequently exceeds these limits. However, regulatory standards vary globally, and many countries have not yet established clear PFAS limits for food products, creating a patchwork of protection for consumers.

Steps to Reduce Your PFAS Exposure

• Vary Your Seafood Choices: Instead of eating the same fish species repeatedly, rotate between different types of fish and shellfish to avoid accumulating PFAS from a single source.
• Know Your Fish Source: Saltwater fish generally have lower PFAS levels than freshwater varieties; ask your fishmonger or check labels to identify where your fish was caught.
• Balance Animal Products: Diversify your protein sources to include plant-based options like beans, legumes, and nuts, which don't accumulate PFAS the way animal products do.
• Choose Organic When Possible: Organic eggs and dairy from farms in less industrialized areas may have lower PFAS exposure, though this isn't guaranteed.
• Filter Your Drinking Water: Use a water filtration system certified to remove PFAS, as contaminated water can be a significant exposure source independent of food.

What Are Regulators Doing About This?

The challenge facing food safety agencies is that PFAS regulation is still evolving. The European Union has been more proactive in setting limits, but the United States and many other countries are still developing comprehensive PFAS food safety standards. This review was conducted to help inform global regulatory decisions and establish consistent safety thresholds.

The World Health Organization and national food safety agencies are increasingly recognizing PFAS as a food safety priority, but without universal testing requirements and labeling standards, consumers have limited visibility into PFAS levels in the foods they buy. This knowledge gap underscores why understanding which foods carry the highest risk is so important for making informed dietary decisions.

The bottom line: PFAS contamination in food is a real concern, particularly for regular seafood consumers. While you don't need to eliminate fish and shellfish entirely—they offer valuable nutrients—being strategic about variety, sourcing, and complementing your diet with plant-based proteins can help reduce your cumulative exposure to these persistent chemicals.