They're in our oceans, our air, our food, and now even in our bodies. Microplastics, once a distant environmental issue, have become a topic of urgent relevance in medicine, public health, and nutrition. The idea that tiny plastic particles are circulating through the food chain and accumulating in human tissues has sparked headlines, speculation, and concern. But how much of this fear is grounded in solid science? And how much is still unknown? As the research into microplastics rapidly grows, so too does the confusion. Claims range from the plausible to the alarmist, yet the real picture is far more complex. What does current evidence actually tell us about the health implications of microplastic exposure? How do we weigh these emerging signals against the backdrop of other environmental threats we understand much better? And how should scientifically-minded practitioners think about this issue, especially when patients begin asking questions? This is a conversation that calls for clarity, nuance, and a rigorous look at what we know versus what remains speculative. In this episode, Professor Ian Mudway, an environmental toxicologist, discusses the current scientific understanding of microplastics and human health. Timestamps [03:31] The public's fascination with microplastics [08:35] Defining microplastics and nanoplastics [11:35] Environmental presence of microplastics [14:54] Human exposure to microplastics [18:23] Challenges in measuring microplastics [21:38] Public perception vs. scientific reality [27:08] Challenges in microplastic research [29:53] Environmental impact and human health [33:08] Complexities of plastic additives [40:34] Future directions in microplastic research [48:09] Key ideas segment (Premium-only) Resources Subscribe to Sigma Nutrition Premium Join the Sigma email newsletter for free Enroll in the next cohort of our Applied Nutrition Literacy course Gresham College YouTube lectures Go to sigmanutrition.com

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