Show Notes
Join host Ryan Feldman in an insightful episode of "The Poison Lab" as he sits down with Dr. John Downs, Director of the Virginia Poison Center, and one of the leading experts on per- and polyfluoroalkyl substances (PFAS), commonly known as "forever chemicals." Known for their persistence in the environment and human body, PFAS have raised significant public health concerns over the past few decades. Dr. Downs shares his journey through occupational medicine, toxicology, and public health, which uniquely positioned him to provide expertise on PFAS exposure, health risks, and ongoing regulatory efforts. Together, they delve into the origins, uses, and potential health effects of these ubiquitous compounds, while examining government policies, environmental impact, and strategies to reduce exposure. A must-listen for anyone interested in the intersection of environmental health and toxicology! Episode Breakdown: 2:42 – What Are Forever Chemicals? 8:01 – History of PFAS and Associated Health Concerns 15:41 – Government Regulation of PFAS 20:42 – Shortcomings in PFAS Regulation 25:20 – How Individuals Can Mitigate Risk 31:15 – Testing for PFAS Levels and Exploring Treatment Options 41:14 – Future Directions and Research Needs for PFAS 45:29 – Conclusion and Outro
Key Topics Discussed 2:42 – What Are Forever Chemicals? PFAS are a large group of man-made chemicals that are persistent in the environment and human body. The podcast focuses primarily on PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanoic sulfonic acid), as these were the first compounds identified as having very long elimination half-lives, measured in years, and not undergoing significant human metabolism The podcast mentions that there are potentially thousands of different PFAS compounds and that more research is needed to determine if they all induce the same health effects as PFOA and PFOS Commonly used for their water- and oil-resistant properties in nonstick cookware, fast food wrappers, firefighting foams, and more.
8:01 – History of PFAS and Associated Health Concerns First created by Dupont chemical, used widely in 1940's in Teflon Large contamination of water by PFAS identified in West Virginia town Led to landmark study in West Virginia (the C8 study) on epidemiological data of PFAS-related health risks. Effects noted: High cholesterol, thyroid dysfunction, ulcerative colitis, hypertension in pregnancy, decreased immune response to vaccine, and certain cancers (testicular and kidney cancer).
PFAS in the Environment PFAS are not easily degraded, leading to bioaccumulation in humans and animals. Non-stick cookware: Teflon, the trade name for non-stick cookware, was one of the earliest applications of PFAS, utilizing PFOA. Firefighting foam: PFAS was used in firefighting foams, particularly for aviation fuel fires. This has led to contamination of groundwater around military installations and airports. Fast food wrappers and other consumer products: PFAS are used to make products water and oil resistant, including fast food wrappers, clothing, upholstery, and popcorn bags. Biosolids: The nitrogenous waste produced after wastewater treatment, have been found to contain concentrated PFAS. These biosolids are sometimes sold to farms as fertilizer, potentially contaminating water and crops. Ski wax: Ski waxers have been found to have a high degree of PFAS exposure10. Major sources contaminated drinking water, military bases, and consumer product (Teflon, waterproof jackets, popcorn bags etc...)
15:41 – Government Regulation of PFAS EPA Health Advisory Limits (2009): These were the first non-enforceable limits set for PFOA and PFOS in drinking water. These limits were revised several times over the next 15 years, becoming progressively lower. EPA Enforceable Limits (2024): The EPA published its final rule for enforceable limits, known as maximum contaminant levels (MCLs), in April 2024. The goal is for PFOA and PFOS to be completely non-detectable in drin
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Hey everyone, it’s Ryan. I know many of you are patiently waiting for Episode 6 of A Morel Dilemma, and it is coming next week. I genuinely cannot wait for you to hear this one. But it is actually available right now for supporter members. You can go to www.thepoisonlab.com/support and get every single episode right now for as little as $1 a month. And full disclosure, I only get about half of that. It does not go to profit. It just helps repay some of the very real costs of making this show: the interviews, editing, sound design, hosting, and the absurd amount of time that went into producing it. So if you have been enjoying the series, becoming a supporter is an incredible way to help make work like this possible. And if you are already supporting the show, thank you. Truly. It helps more than you know. And for everyone else listening, thank you for being here and for sharing the series. But for today, I wanted to give everyone a small glimpse into the supporter bonus episodes that have been available to members throughout the series. See the episode here https://the-poison-lab.captivate.fm/episode/a-morel-dilemma-preview-supporting-member-bonus-episodes A Morel Dilemma Support the show Review the show where ever your listening Get Messages from Toxo (Join the Newsletter!) Join as a supporting member Ad free episodes Bonus content and early access Discounts and give aways on GOTA PICCEM Mushroom card game