PFAS Exposure & Bone Density in Teens: New Research Findings

The developing bones of adolescents may be particularly vulnerable to the effects of PFAS, commonly known as “forever chemicals,” according to new research published in the Journal of the Endocrine Society. The study suggests that early-life exposure to these man-made substances could influence bone development, potentially impacting bone health throughout a person’s life.

PFAS – per- and polyfluoroalkyl substances – are a large group of chemicals used in a wide array of consumer and industrial products, from non-stick cookware and firefighting foam to food packaging and water-resistant clothing. Their persistence in the environment and the human body is a growing concern, as scientists investigate potential links to various health problems. Many PFAS do not break down easily, leading to their accumulation over time. This persistence is what earned them the moniker “forever chemicals.”

Adolescence: A Critical Window for Bone Development

“Adolescence is a key period for building strong bones, and achieving optimal bone mass during this time can reduce lifelong risks of fractures and osteoporosis,” explains Jessie P. Buckley, Ph.D., M.P.H., of the UNC Gillings School of Global Public Health in Chapel Hill, N.C., and a lead author of the study. “Our findings suggest reducing PFAS exposure during key developmental windows could support healthier bones throughout life.” Osteoporosis, a condition characterized by weakened bones, significantly increases fracture risk, particularly in older adults.

The research team analyzed blood samples collected from 218 adolescents participating in a long-term pregnancy and birth cohort study. PFAS levels were measured at multiple time points – at birth, and at ages 3, 8, and 12. Bone density was assessed when the participants reached age 12, using measurements of the forearm. The study, titled “Per- and Poly-fluoroalkyl Substances and Adolescent Bone Mineral Density: Assessing Periods of Susceptibility,” provides valuable insights into the timing of PFAS exposure and its potential impact on bone health. You can find the full study here.

PFOA and Lower Bone Density

The study revealed a correlation between higher levels of perfluorooctanoic acid (PFOA), a specific type of PFAS, in the blood and lower bone density in the forearm. PFOA was once widely used in the production of Teflon and other fluoropolymers, but its production has been largely phased out in the United States due to health concerns. However, because it persists in the environment, exposure remains possible through contaminated water and food.

It’s important to note that this study demonstrates an association, not necessarily causation. While the findings suggest a link between PFOA and lower bone density, they do not prove that PFOA directly causes lower bone density. Other factors, such as genetics, diet, physical activity, and overall health, also play a significant role in bone development.

Timing and Gender: Nuances in PFAS Effects

The relationship between PFAS exposure and bone density wasn’t uniform across all PFAS compounds. Researchers found that the timing of exposure appeared to matter, with certain developmental stages potentially being more sensitive to the effects of these chemicals. This suggests that exposure during specific windows of vulnerability could have a more pronounced impact on bone health.

Interestingly, the connection between PFAS levels and lower bone density was more pronounced in females than in males. This finding highlights the potential for sex-specific differences in susceptibility to PFAS-related health effects. The reasons for this difference are not fully understood and warrant further investigation.

Broader Health Implications and Ongoing Research

This research adds to a growing body of evidence suggesting that early-life PFAS exposure may have long-term health consequences. The Endocrine Society has also highlighted these concerns, noting that PFAS exposure may weaken teens’ bones. Beyond bone health, PFAS exposure has been linked to a range of other health issues, including immune system dysfunction, liver damage, and certain types of cancer. The U.S. Environmental Protection Agency (EPA) has been working to establish national drinking water standards for PFAS, recognizing the widespread contamination and potential health risks. You can find more information about the EPA’s PFAS strategy here.

Understanding Bone Mineral Density

Bone mineral density (BMD) is a measure of the amount of mineral content in bone tissue. It’s a key indicator of bone strength and is often used to diagnose osteoporosis and assess fracture risk. Lower BMD indicates weaker bones and a higher risk of fractures. BMD naturally declines with age, but factors like diet, exercise, and exposure to environmental toxins can influence the rate of decline.

What Comes Next: Surveillance and Mitigation

The researchers emphasize the importance of reducing PFAS exposure, particularly during critical developmental windows. This includes efforts to minimize contamination in drinking water and consumer products. Ongoing surveillance of PFAS levels in the environment and human populations is crucial for tracking exposure trends and assessing the effectiveness of mitigation strategies. Further research is needed to fully understand the mechanisms by which PFAS affect bone development and to identify potential interventions to protect adolescent bone health. The study team included researchers from Johns Hopkins Bloomberg School of Public Health, Brown University, the U.S. Centers for Disease Control and Prevention, the University of Cincinnati College of Medicine and Cincinnati Children’s Hospital, the University of Pennsylvania, Simon Fraser University, and The George Washington University Milken Institute School of Public Health, demonstrating a collaborative effort to address this complex public health issue. Medical Xpress also covered the study, providing additional context.

For individuals concerned about PFAS exposure, it’s advisable to stay informed about local water quality reports and consider using water filters certified to remove PFAS. Maintaining a healthy diet rich in calcium and vitamin D, and engaging in regular weight-bearing exercise, are also important for supporting bone health. If you have concerns about your own bone health, consult with a qualified healthcare professional.