The Dietary PFAS Burden: Beyond Drinking Water
Drinking water is the most regulated and most discussed PFAS exposure pathway—but for many populations, food contributes at least as much as water to total PFAS body burden. The food system delivers PFAS through multiple pathways: migration from PFAS-treated food contact materials (packaging, cookware, processing equipment); agricultural contamination of crops and livestock through PFAS-contaminated soil and water; bioaccumulation in seafood and animal products; and processing aids used in food manufacturing. Understanding the full dietary PFAS exposure picture is essential for regulators setting tolerable daily intakes, for risk communicators explaining PFAS exposure to the public, and for consumers seeking to reduce personal PFAS intake.
Food Contact Material Migration: The Packaging Pathway
PFAS migration from food packaging, cookware, and food processing equipment into food has been documented in numerous studies. FDA’s food contact substance migration testing found: microwave popcorn bags: 100–500 ng/g PFAS in the food product; fast food wrappers (before phase-out): 20–200 ng/g in adjacent food; nonstick cookware (at high temperature): 1–10 ng/L in cooking water, lower in solid foods; food processing equipment (PTFE gaskets, conveyor belt PTFE coatings): variable contribution to processed food products. The FDA’s 2024 voluntary phase-out completion for food packaging PFAS significantly reduces this pathway for US consumers—but international food imports from countries with less stringent packaging standards continue to deliver PFAS through food contact materials.
EFSA Dietary Exposure Assessment
EFSA’s 2020 PFAS risk assessment—the most comprehensive dietary exposure assessment conducted for any PFAS compound—estimated total dietary exposure (food + drinking water) for European populations: mean adult PFAS dietary exposure: 3.4 ng/kg body weight/week (sum of 4 PFAS); 95th percentile: 8.1 ng/kg/week; children (3–9 years) 95th percentile: 12.8 ng/kg/week. These exposures were compared to EFSA’s tolerable weekly intake of 4.4 ng/kg/week—finding that the 95th percentile adult and virtually all children exceed the TWI through diet alone, without counting drinking water exposure. This finding was the scientific basis for EFSA’s conclusion that current European PFAS exposure poses a public health concern requiring regulatory action across food contact materials, food production, and drinking water simultaneously.
FDA Maximum Residue Levels: The Coming Standard
FDA and USDA are developing PFAS maximum residue levels (MRLs) for specific food commodities—the food safety equivalent of drinking water MCLs. FDA’s PFAS in food workplan (published 2023) identified five priority food categories for MRL development: leafy vegetables, root vegetables, fresh produce from contaminated agricultural areas, meat from livestock exposed to contaminated feed/water, and seafood from contaminated waters. EFSA’s MRL derivations, based on the TWI of 4.4 ng/kg/week, suggest MRLs of approximately 0.5 µg/kg for PFOS in beef liver and 0.1 µg/kg for PFOA in leafy vegetables—values that, if adopted, would result in food safety enforcement actions against agricultural products from many PFAS-impacted farming regions. FDA MRL finalization is expected 2025–2027 for priority food categories.
Addressing PFAS dietary exposure requires a multi-pathway approach—reducing exposure from drinking water through certified filtration, eliminating PFAS from food contact materials, and managing agricultural PFAS through biosolids controls and soil remediation.