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In this “Ask Me Anything” (AMA) episode, Peter tackles a topic that's been dominating headlines and sparking widespread concern: microplastics and plastic-associated chemicals, including BPA, PFAS, and phthalates. Peter explores the science behind these substances including how and why they've become so prevalent, the extent of our exposure, and the potential risks to our health. Most importantly, he provides a practical framework for understanding microplastics and plastic-associated chemicals and minimizing exposure while distinguishing genuine risks from exaggerated concerns.

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We discuss:

The complexity of the topic of microplastics and associated chemicals [1:30];
Definitions: microplastics, BPA, PM2.5, phthalates, and more [6:30];
The reasons behind the increase in microplastics in our environment and the surge in interest in them [12:00];
The various ways that humans are exposed to microplastics and nanoplastics [14:00];
Volume of plastic consumed by humans, and how the body eliminates or absorbs microplastics [16:00];
How microplastics accumulate in the body, the variability in tissue accumulation, and the challenges in studying their long-term health effects [21:30];
Limitations of blood tests for microplastics, and the importance of reliable biomarkers for guiding behavior and interventions [26:30];
The speculative health risks of microplastics, the limitations of current research, and the need for more robust studies [29:15];
The challenges of measuring microplastics in human tissues, the need for better methodologies, and the importance of critically evaluating study relevance and claims [39:45];
If it’s unclear whether microplastics actually cause harm, should we still be concerned about exposure? [42:15];
Strategies to minimize microplastic exposure [45:00];
The financial cost and effort involved in various microplastic exposure mitigation strategies [51:00];
The role of airborne microplastics in total exposure and accumulation [1:03:00];
Chemicals associated with plastics, their role as endocrine disruptors, and the challenges in linking exposure to specific health outcomes [1:04:00];
BPAs: role in plastic production, and its potential developmental risks [1:05:45];
BPA's potential health risks: pregnancy, fertility, obesity, and diabetes, and the socioeconomic confounders in the data [1:08:30];
Regulatory limits on BPA exposure, and practical considerations for reducing exposure [1:12:45];
The prevalence of BPA in modern products and how to identify it [1:17:15];
Why PFAS are considered endocrine disruptors [1:19:45];
The main sources of PFAS exposure, and practical steps to reduce exposure [1:21:30];
The potential health risks of PFAS exposure [1:24:00];
Phthalates: role in making plastics flexible and presence in personal care products [1:24:45];
Why phthalates are considered endocrine disruptors [1:25:15];
The main sources of phthalate exposure, and how manufacturing practices are evolving to reduce exposure [1:26:45];
Practical strategies to reduce exposure to phthalates in food, air, water, and personal care products [1:28:30];
Navigating microplastics and associated chemicals: a framework for personalized risk reduction [1:29:30]; and
More.

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