How microplastics cross barriers to the brain

Sabine explains blood-brain barrier compromise, olfactory nerve route, and findings of plastics in human brains.

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Plastic is everywhere. In our homes, on our streets, in our oceans. But recent research suggests it’s also inside us: in our blood, our organs, even our brain. So how concerned should we be?

Today, Jonathan and Dr. Federica Amati are joined by longevity doctor and clinician Dr. Sabine Donnai to explore one critical question: what does plastic exposure mean for our long-term health?

Dr. Donnai breaks down how microplastics travel from packaging, food, and air into our bloodstream, and why their size means they may cross biological barriers once thought impenetrable, including the blood-brain barrier. The conversation also looks at the broader health implications of plastic-associated chemicals like BPA, their potential links to hormone disruption, inflammation, and cardiovascular risk, and why avoiding them may be especially important for those living in urban areas.

For listeners keen to take practical steps, this episode offers simple and empowering guidance. Dr. Donnai shares specific tools that can reduce your exposure without creating unnecessary fear or overwhelm. You’ll also hear how diet plays a key role in supporting your body’s natural detox processes and why a colourful, fibre-rich diet may help us all manage the modern plastic burden.

If plastics are entering your brain and bloodstream, what does it mean for your future health? And how much control do we really have in a world built on plastic?

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Timecodes

00:00 Intro

03:20 Plastic production has doubled- why isn’t it slowing down?

05:55 What exactly are microplastics?

07:15 Why microplastics are in the air you breathe

09:10 The hidden plastic in your tumble dryer

11:10 How long do microplastics last?

12:20 Sushi trays, black plastic & hidden fire retardants