#332 - AMA #67: Microplastics, PFAS, and phthalates: understanding health risks and a framework for minimizing exposure and mitigating risk
Peter Attia, MD, introduces an AMA episode (AMA #67) focusing on microplastics and associated chemicals like BPAs, PFAS, and phthalates. He discusses their ubiquity, human exposure routes, and the challenges in understanding their health impacts, aiming to provide a framework for risk reduction.
Deep Dive Analysis
7 Topic Outline
Introduction to Microplastics and Associated Chemicals
The Challenge of Analyzing Microplastics and Chemicals
Defining Microplastics, Nanoplastics, BPA, PM2.5, and Phthalates
Reasons for Increased Microplastic Prevalence and Research
Human Exposure Pathways to Microplastics and Nanoplastics
Quantifying Human Microplastic Consumption
How the Body Eliminates Absorbed Microplastics
6 Key Concepts
Microplastics
Plastic particles typically defined as smaller than five millimeters, though current studies often focus on those smaller than one millimeter. They are completely ubiquitous, found in water, food, air, and living organisms.
Nanoplastics
Plastic particles that are smaller than one micrometer (one one-thousandth of a millimeter). These are of particular concern due to their minute size, which allows for potential absorption into the body.
BPA (Bisphenol A)
A chemical historically used to make hard polycarbonate plastics, epoxies, and resins. While its active use has been reduced, it's often replaced by other bisphenols like BPS and BPF, whose safety is not yet fully clear.
PM2.5
Particulate matter in the air smaller than 2.5 micrometers. Particles of this size, if inhaled, have the potential to become systemic by crossing the lung's epithelial barrier and entering the bloodstream. Most PM2.5 is not microplastic, primarily originating from air pollution sources like fires and fossil fuel combustion.
Phthalates
A class of chemicals used in plastics to increase flexibility and found in personal care products like shampoos, lotions, and laundry detergents to make fragrances last longer. Their use is still allowed in food contact applications and personal care products, though some companies have voluntarily reduced their use.
Epithelial Barrier
The protective layer of cells on the surface of the body (skin) and lining internal organs (like the gut and lungs). This barrier is the body's first line of defense against microplastics, preventing larger particles from entering the body.
6 Questions Answered
Microplastics are plastic particles smaller than 5 millimeters, with nanoplastics being even smaller (<1 micrometer). Related chemicals include BPA (used in hard plastics), PM2.5 (airborne particulate matter <2.5 micrometers), and phthalates (used to make plastics flexible and in personal care products).
The proliferation of plastics since the 1950s has led to their accumulation in the environment, and there's also been a significant increase in scientific research and public attention focused on detecting and studying them.
Humans are primarily exposed through inhaling plastic dust and fibers, and by consuming food and beverages such as seafood, salts, water (tap and bottled), fruits, vegetables, meats, milk, beer, and wine.
While highly variable, estimates suggest humans consume between 10 and 300 micrograms of micro-nanoplastics per week. The widely circulated claim of consuming a 'credit card's worth' (5 grams) of plastic per week has been largely debunked.
The body primarily eliminates microplastics through coughing, sneezing, urine, and stool. Larger particles (>10 microns) are removed efficiently, with about 99% of ingested microplastics being eliminated via stool within 24 to 72 hours.
Particles smaller than 2.5 micrometers can be absorbed through both the lungs and the gut. In the gut, particles up to 10 micrometers are practically absorbed, though theoretically, the gut lining could absorb particles as large as 150 micrometers.
3 Actionable Insights
1. Use Non-Plastic Drinkware
Consider using non-plastic containers, such as a metal camping coffee cup, for beverages. This practice is implicitly endorsed as a way to avoid plastic exposure, especially when discussing microplastics and related chemicals.
2. Access Full AMA Episodes
Become a premium member to hear the complete version of AMA episodes, which offer detailed responses to subscriber questions and in-depth clarity on topics of special interest.
3. Connect on Social Media
Find Peter Attia on YouTube, Instagram, and Twitter using the handle @peterattiamd to engage with additional content and updates.
4 Key Quotes
If you are listening to this thinking that there is a punchline and a one-word answer, I'm going to spare you the disappointment. This is a very nuanced topic.
Peter Attia
This has been a royal pain in the ass to prepare for.
Peter Attia
Further from the shore, the deeper the water.
Nick
A lie will travel around the world or halfway around the world before the truth has a chance to pull its boots on.
Peter Attia