Pesticide Exposure: What Your Diet Reveals About Chemical Levels in Your Body

A new study from the Environmental Working Group (EWG) reveals a direct link between the fruits and vegetables people consume and the levels of pesticide chemicals found in their bodies. While a diet rich in produce is vital for health, the research highlights that everyday food choices can significantly impact exposure to substances linked to cancer, hormone disruption, and developmental harm.

Diet as a Key Driver of Pesticide Exposure

Researchers found that individuals who ate more fruits and vegetables known to carry higher pesticide residues – such as strawberries, spinach, and bell peppers – had significantly higher levels of those chemicals in their urine. This suggests that diet plays a major role in determining an individual’s pesticide exposure. Science Daily reported on the findings on March 4, 2026.

How the Study Was Conducted

The EWG researchers analyzed U.S. Department of Agriculture data on pesticide residues in produce collected between 2013 and 2018. This data was combined with dietary survey responses and urine biomonitoring data from 1,837 participants in the Centers for Disease Control and Prevention’s (CDC) National Health and Nutrition Examination Survey (NHANES) from 2015 to 2016. Scientists developed a “dietary pesticide exposure score” to estimate individual exposure based on produce consumption and residue levels, accounting for the frequency, amount, and toxicity of each chemical.

Key Findings: Pesticide Mixtures and Monitoring Gaps

The analysis revealed several crucial patterns:

• Diet plays a major role: Higher residue produce consumption correlated with increased pesticide levels in urine.
• Monitoring gaps remain: NHANES currently tracks only a portion of the pesticides found on food. Broader monitoring may be necessary to fully understand exposure levels.
• Exposure involves mixtures: USDA testing detected residues of 178 different pesticides, but urine samples only measured 42, suggesting total exposure may be underestimated.
• Potatoes complicated analysis: The link between produce intake and pesticide levels was clearer after removing potatoes from the dataset due to the challenges of estimating exposure from various potato preparations.

Concerns About Current Regulations

The study raises questions about whether current Environmental Protection Agency (EPA) safety standards adequately protect public health. The EPA typically sets limits for individual pesticides, but does not account for cumulative exposure to multiple residues commonly found on produce. Researchers suggest their exposure scoring method could help regulators and scientists better evaluate real-world dietary exposure and improve protections, especially for children and pregnant individuals.

What Consumers Can Do

The EWG encourages a diet rich in fruits and vegetables, whether conventionally grown or organic. Switching to organic options can significantly lower pesticide biomarkers in the body within days. The EWG recommends prioritizing organic purchases for items on its “Dirty Dozen” list – those with the highest pesticide residues – and considering the “Clean Fifteen” list, which features produce with the lowest residues. Learn more about the EWG’s research on pesticides.

Looking Ahead

Further research is needed to understand the long-term health effects of dietary pesticide exposure. Continued robust federal data collection, like that provided by the USDA and CDC, is crucial for informing policy and protecting public health.