Residents Near Bucks County Military Bases Show Higher Toxic Levels Than National Average

Understanding the Impact of PFAS on Health

Residents in Bucks and Montgomery Counties, particularly those living near military bases, have been found to have higher levels of four “forever chemicals” known as PFAS in their blood compared to the average American. These findings were released by federal health officials and are part of a large-scale study conducted by the Centers for Disease Control and Prevention (CDC) and the Agency for Toxic Substances and Disease Registry (ATSDR). The research aims to understand how exposure to PFAS from drinking water may affect health.

PFAS, or per- and polyfluoroalkyl substances, are man-made chemicals that have been used since the 1940s. They are commonly found in products such as waterproof clothing, nonstick cookware, grease-resistant packaging, and firefighting foams. These chemicals are often called “forever chemicals” because they do not break down easily in the environment or the human body.

The study tested the blood of participants from eight states between 2019 and 2023 for various PFAS compounds. The results showed that nearly all adults and children living near military bases had detectable concentrations of seven different PFAS compounds, including:

• PFOS
• PFOA
• PFHxS
• PFNA
• PFDA
• PFUnDA
• MeFOSAA

Pennsylvanians living near suburban military bases had some of the highest average levels of at least four PFAS compounds among those tested across the eight states. However, the health impact of these findings remains unclear, as the results are preliminary and subject to further analysis.

Health Outcomes Associated with PFAS Exposure

The study examined several potential health outcomes related to PFAS exposure, including lipid levels, thyroid issues, diabetes, blood pressure, metabolic syndrome, heart disease, and obesity.

Lipids and Cholesterol

Researchers found that higher levels of five PFAS compounds were associated with increased total cholesterol in adults. This includes both HDL (good cholesterol) and LDL (bad cholesterol), but not necessarily triglycerides. Some PFAS compounds showed stronger associations with cholesterol levels than others. Future studies will focus on children and their lipid profiles.

Thyroid Function

Thyroid hormones play a crucial role in regulating metabolism, growth, and development. The study found that higher PFAS levels were linked to a lower prevalence of hypothyroidism overall. However, in females, higher levels of PFHxS were associated with an increased risk of hypothyroidism. In males, higher PFOS levels were linked to a higher prevalence of hyperthyroidism.

Diabetes

Previous studies on PFAS and diabetes have shown conflicting results. This study looked at markers such as glucose, insulin, and A1c. It found that about 12% of adults in the study had diabetes, similar to the U.S. population. No significant association was found between PFAS levels and the likelihood of developing diabetes. In fact, some individuals with higher PFAS levels were less likely to have diabetes.

Blood Pressure

Higher levels of PFOS and PFHxS were associated with elevated blood pressure, particularly in younger adults aged 18 to 29. The effects were more pronounced in those aged 25 to 30 who had a midrange body mass index.

Metabolic Syndrome

Metabolic syndrome is a group of conditions that increase the risk of cardiovascular disease. The study found that higher PFOA and PFOS levels were associated with a lower likelihood of metabolic syndrome. However, higher PFAS levels were also linked to increased levels of MCP-1 and PAI-1, which are indicators of metabolic syndrome.

Heart Disease

Heart disease is the leading cause of death in the U.S. While some previous studies have linked PFAS to an increased risk of cardiovascular diseases, this study found no significant association between PFAS levels and heart disease among participants.

Obesity

Interestingly, the study found that individuals with higher PFAS levels were less likely to be obese. Researchers measured indicators such as body mass index, waist circumference, and body roundness index. The exact mechanisms behind this relationship remain unclear.

Limitations and Future Research

While the study provides valuable insights into the potential health impacts of PFAS exposure, it is important to note that the findings are preliminary. The researchers emphasize that conclusions about cause-and-effect relationships are limited due to the lack of data on PFAS levels before disease onset. Additionally, participants were tested after they had stopped consuming PFAS-contaminated water, meaning their blood levels may have been higher before they ceased exposure.

Further research is needed to fully understand the long-term health effects of PFAS exposure. The study will present more detailed findings at a conference in August, offering additional insights into this complex issue.