Burritos, Cheese, Fish Tied to PFAS in Kids' Blood: Study

A study published on September 22, 2026, in the Journal of Exposure Science and Environmental Epidemiology found that specific foods like burritos, cheese, beef, and fish, along with school lunch participation, correlate with distinct blood PFAS levels in Hispanic children in Northern Virginia.

Key takeaways

• Published on September 22, 2026, a George Mason University study linked burrito and cheese intake to higher PFHpA blood levels in Hispanic children in Northern Virginia.
• Higher fish and beef intake were tied to increased odds of detectable PFBS, whereas free or reduced-price school lunch participation predicted lower levels of PFHpA, PFOA, and PFHxS.
• The study analyzed plasma collected between 2017 and 2021 before PFAS grease-proofing agents for U.S. paper food packaging went off the market in February 2024, and did not directly test food items or cookware.

What happened

On September 22, 2026, a research team led by George Mason University published an open-access study titled "Dietary and social predictors of PFAS exposure in Hispanic children from Northern Virginia" in the Journal of Exposure Science & Environmental Epidemiology. The authors, led by first author R. Mohsin with senior author M. S. Bloom and co-authors including R. R. Gerona and S. Gallo, investigated internal chemical exposures within a localized community cohort.

The investigation was conducted as a cross-sectional analysis embedded within the VALE (Vidas Activas, Familias Saludables) study, which was a 10-week culturally tailored lifestyle intervention based in Prince William County, Virginia. The study enrolled 110 Hispanic children aged 4 to 11 between 2017 and 2021. The vast majority of participants had overweight or obesity (at or above the 85th BMI percentile), alongside 11 healthy-weight comparison children. Approximately 65% of the enrolled cohort identified as Salvadoran.

Funding for the research was provided by the National Institute of Environmental Health Sciences (NIEHS grant R03ES035536), the George Mason University Provost Multidisciplinary Research Initiative, and the Potomac Health Foundation. The study authors formally declared no competing financial interests.

What the study found

Prior environmental health literature has established that diet is a major pathway for human PFAS intake, but community-specific dietary patterns in understudied pediatric populations remained unclear. In this study, parents completed the Block Kids Food Screener alongside social questionnaires, while researchers measured 12 distinct PFAS in child plasma using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The primary dietary-factor table evaluated data from 70 children.

Of the 12 PFAS measured, PFOS (median 2.73 ng/mL) and PFOA (median 1.29 ng/mL) were found at the highest concentrations, according to the published paper. Several foods were associated with specific PFAS:

• Burrito intake was associated with higher perfluoroheptanoic acid (PFHpA), showing a mean difference of 1.45 ng/mL per interquartile range (IQR) greater consumption (95% CI 0.56 to 2.35).
• Cheese intake was similarly associated with higher PFHpA levels, showing a mean difference of 0.87 ng/mL (95% CI 0.01 to 1.76).
• Fish consumption was linked to higher odds of perfluorobutanesulfonic acid (PFBS) detection above the laboratory limit of detection (odds ratio [OR] 1.55, 95% CI 1.17 to 2.36).
• Beef consumption was also tied to greater odds of PFBS detection above the limit (OR 1.44, 95% CI 1.01 to 2.12).

Social and demographic factors also yielded measurable differences. Participation in free or reduced-price school lunch programs predicted lower plasma levels across three chemicals: PFHpA (mean difference -0.61 ng/mL, 95% CI -1.13 to -0.10), PFOA (mean difference -0.22 ng/mL, 95% CI -0.44 to -0.01), and perfluorohexane sulfonate (PFHxS) (mean difference -0.64 ng/mL, 95% CI -0.64 to -0.06). In addition, children born in the United States had lower PFHpA (mean difference -0.54 ng/mL, 95% CI -1.20 to 0.09) and reduced odds of detectable PFBS (OR 0.25, 95% CI 0.06 to 0.88).

Who is affected?

This specific dataset centers on young Hispanic children living in Prince William County, Virginia, primarily from Salvadoran backgrounds. Because chemical biomonitoring studies often sample broad national cross-sections, targeted analyses help characterize how local food access, cultural culinary habits, and socioeconomic programs intersect with chemical exposures.

However, several population-level boundaries must be kept in mind when evaluating the findings. The primary dietary analysis relied on a subsample of 70 children. Because the study was localized to a single Virginia county and primarily evaluated children classified with overweight or obesity, the results cannot be automatically generalized to all Hispanic children across the United States, nor do they apply directly to adolescents, adults, or non-Hispanic demographics.

Furthermore, the researchers noted that the Block Kids Food Screener utilized a fixed, pre-specified food list. This instrument did not capture consumption of pupusas, a staple food widely eaten within the 65% Salvadoran cohort. The omission of this staple dish may have introduced exposure misclassification, obscuring other traditional meal contributions.

What it means for shoppers

For parents reading labels and planning family meals, these findings add nuance rather than a reason for alarm. PFAS never appear on an ingredient list. Unlike food additives, PFAS are non-intentionally added industrial contaminants that migrate from packaging, bioaccumulate through agricultural food chains, or persist in water supplies.

One of the chemicals tied to burritos and cheese here, PFHpA, has its own recent research history; see PFHpA, a Lesser-Known 'Forever Chemical', Linked to Liver Cancer. The researchers noted that the association between burritos and higher PFHpA levels could reflect combined environmental exposure from composite ingredients, including meats, dairy cheeses, and grease-resistant packaging materials. Crucially, however, the researchers did not collect specific burrito recipes, cooking preparations, or packaging types, and they did not test whether meals were prepared at home or purchased from commercial fast-food chains.

Shoppers should also recognize that no individual food products, brands, or wraps were chemically tested in this study. The associations are derived purely from statistical modeling between self-reported questionnaires and blood measurements. Moreover, the study did not measure clinical health outcomes, meaning the detected plasma levels were not shown to cause specific health issues or illnesses in the participants.

The background

PFAS represent a diverse class of thousands of synthetic fluorinated chemicals prized for their water- and oil-resistant properties. Over decades of industrial and consumer use, widespread persistence led to ubiquitous global distribution. In the United States, the FDA obtained commitments from manufacturers in 2020 to stop selling certain PFAS grease-proofing substances for food contact. On February 28, 2024, the FDA announced that grease-proofing substances containing PFAS were no longer being sold for food contact use in the U.S., completing a voluntary phase-out for packaging such as fast-food wrappers, microwave popcorn bags and take-out paperboard containers. Europe is taking a regulatory route for one PFAS; see EU Bans PFHxA in Food Packaging Paper From October 10, 2026.

This regulatory timeline is an essential contextual detail when reading the Virginia findings detailed in the study publication. The blood samples evaluated by the George Mason University team were gathered from children between 2017 and 2021. Because this enrollment window predated the February 2024 packaging transition, the children's exposures reflect a historical packaging and distribution baseline.

Finally, several critical research limitations were stated directly by the study authors. The study's cross-sectional design cannot confirm causal direction or temporality. The modest sample size reduced statistical power, requiring multiple imputation methods for 38 participants with missing covariate information, meaning certain associations could be imprecise or influenced by chance. Key environmental vectors, including primary drinking water source, cookware, and household cleaning products, were not measured or controlled for in the study.

What to watch next

The authors' own limitations point to what a follow-up would need: measurements of home drinking water, cookware and cleaning products, and a food screener that captures community staples like pupusas.

One open question is whether children's blood levels fall now that PFAS grease-proofing agents are off the U.S. market. This study's samples predate that change, so it cannot answer it.