My recent series on plastics worried a lot of you. I know, because you told me. The question: okay — so what do I actually do? Here's my answer: You don't need to overhaul your entire life this week. You need to start with one thing. And if you start with one thing, start with your water. Why water first You drink it every day. Your kids drink it every day. It is the single largest, most repeated exposure you have real control over — far more than the occasional plastic-wrapp

If you have not read Parts 1 , 2 , and 3 , I encourage you to do so before continuing. What follows will mean more if you understand what came before it. Part 1 was about what plastic is doing inside your body. Part 2 was about what you can do about it. Part 3 was the hardest thing I have ever written — a reckoning with what plastic is doing to our species, our fertility, and the generations that will follow us into a world we have permanently altered. I ended Part 3 with two

Why I Wrote Part 3 My job is to help you live better. Longevity medicine is about understanding the forces that degrade human vitality and doing everything in our power to slow them down. I want to tell you what started this research. Over the past year I began noticing a pattern in my practice that I could not ignore: young healthy men in their early twenties coming in with low testosterone. By the time I saw the sixth one, I knew something was wrong that went beyond the usu

Last week I told you something that I cannot stop thinking about. I told you that the plastic water bottle you discarded today will still exist in 500 years. I told you that a single liter of bottled water contains 240,000 nanoplastic fragments, and that if you drink a liter a day, you are ingesting 87.6 million of them per year from that single source alone. I told you that the so-called blood-brain barrier — one of the body's most trusted defenses — cannot stop these partic

You eat well. You exercise. You take your supplements. You do everything right. And yet, right now, invisible particles of plastic are circulating in your bloodstream, lodging in your arteries, and quietly disrupting the hormones that govern your metabolism, your brain, and your heart. Yes, it is happening inside your body right now as you are reading this. Microplastics have now been detected in human blood, lungs, liver, kidneys, cancer, placenta, breast milk, and even brai