Are Some People Iodine Deficient?
15 Dec 2025 · 6 min
Dr. Alan Christensen explains how iodine deficiency affected 112 nations in 1991 but public health efforts nearly eliminated it by 2014. The problem shifted: 52 nations now face iodine excess, which triggers thyroid disease in susceptible adults, especially women in North America.
Questions this episode answers
112 nations (1991).
Zero nations (2014).
52 nations (2014).
Seven countries (mild deficiency).
Chapters
Hey JJ Here. Every year around this time, I get the urge to make my home feel a little extra special. A space that feels just like the holidays. And Wayfair is my go to for that. Think cozy textures, twinkly decor, warm lighting, and all those little touches that make you want to curl up with a good book and a blanket. You'll usually find my books stacked on a great little end table I got from Wayfair, proof that function and style can coexist. Now, whether you're adding last minute hosting essentials, picking out gifts for loved ones, or refreshing your decor for the season, Wayfair makes it easy with beautiful finds, great prices and fast delivery. And when the holidays wind down, Wayfair has everything you need to tuck it all neatly away. Smart storage solutions for every room from the kitchen to the closet. Plus, with free shipping for any order over $35, that's fast delivery and a total peace of mind. It's the perfect mix of joy and order, bringing the holiday spirit in, then storing it all with ease. If you're ready to make your home feel as good as it looks, get organized, refreshed and ready for the holidays. For way less head to Wayfair.com right now to shop all things home. Wayfair Every style, every home. That's W-A-Y-F-A-I-R.com hey, it's JJ here.
You know, I've been talking about environmental toxins forever, and laundry detergent is a sneaky one. A lot of them contain harsh chemicals like dyes, preservatives, and even UV brighteners. Those brighteners don't actually clean anything. They just coat fabric so your eyes think things look whiter or brighter. That's more chemicals I don't want on my family's sheets or skin. And if you've got sensitive skin or allergies around the house, this can be a big problem. That's what got my attention about Earth Breeze. It looks like a dryer sheet, but it's actually laundry detergent. You toss one in the washer and that's it. No pouring, no mess, and no heavy plastic jug. Their packaging is lightweight cardboard, which helps reduce plastic waste. And if you choose the fragrance free option, it's gentle, hypoallergenic, non irritating and non sensitizing. I really like how simple it is and how fresh and clean everything comes out without those unnecessary chemicals. Right now you can try Earth Breeze for up to 40% off with free gifts@earthbreeze.com virgin that's earthbreeze.com virgin for up to 40% off plus free gifts on your first order.
This episode is brought to you by Pacifico Here's a story you've probably never heard. Legend has it, decades ago, a couple surfers went down to Mexico in search of epic swells, but they found something unexpected instead. It was still crisp, lively and smooth, but it had nothing to do with waves. It was Pacifico, a delicious Mexican lager. It's like it was brewed to be discovered. Pacifico find your own way. 21 Discover Responsibly Pacifico Clara beer imported.
By Crown Import, Chicago, IL are some people iodine deficient?
Foreign.
This is JJ Virgin, four time New York Times best selling author, celebrity nutrition expert and Fitness hall of Famer. I've been on a lifelong quest for answers to the toughest health questions and now I'm sharing what I found with you. Welcome to Ask the Health Expert. Simone from Instagram asks, are some people iodine deficient? Well, Simone, I have the perfect person to answer this question. He has been deep diving into all things iodine and how they relate to your thyroid and he talks about that in his new book, the Thyroid Reset Diet. Yes, I've got Dr. Alan Christensen, aka Dr. C with me to answer this question. He's a board certified naturopathic endocrinologist and a New York Times bestselling author and a super athlete, including the sport of mountain unicycling. Bet you didn't even know that existed. He'll be right back to answer this question. Stay with us.
Hey, it's J.J. here. Now let's be honest.
The holidays are basically a financial ambush. Travel, hosting gifts, surprise holiday school things. Suddenly you're wondering how December turned into a spending spree. If you want to keep your finances under control this holiday season, you need to be using Monarch. It's rated the Wall Street Journal's best budgeting app of 2025. Monarch is the all in one personal finance tool that brings your entire financial life together in one clean interface on your laptop or your phone. What really grabbed my attention is how fast those little holiday expenses pile up with Monarch. Seeing everything in one place makes it a lot harder to accidentally overspend. And honestly, I appreciate anything that keeps me from starting January with a money hangover. You'll love exploring the holiday spending category. Imagine how good it will feel to actually see what's happening before your credit card statement does that whole dramatic reveal thing. Monarch basically shows you exactly where the money is going in real time, and that Level of clarity could change everything, right? Don't let financial opportunity slip through the cracks. Use the code virgin@monarch.com in your browser for half off your first year. That's 50% off your first year@monarch.com with code Virgin.
The holidays are almost here, but there's still time to score great gifts at Dick's Sporting Goods. Find everyone's must have gifts from Nike, FP movement, Adidas and more. Need your gifts fast? Stop by your local Dick's or shop Dick's.com for fast shipping, curbside pickup or same day delivery. Every holiday starts at Dick's.
If we go back as recently as 1991, there were 112 nations that were categorized as severely iodine deficient. And that's a big deal. The World Health Organization showed that at that level, kids, they didn't develop properly. So the lack of iodine meant that their thyroid glands were not working right and that meant that their brains couldn't develop. And there were several key milestones in those early years that, you know, once you miss them, that's it. The lifelong opportunity for normal brain function has come and gone. And the effects were just huge, hugely negative for that. So that was recent. Now this was 1991. It was 112 nations. At that time, there were no nations that were categorized as at risk for thyroid disease due to iodine excess. So that number was zero. And it was seen by public health arenas what a tragedy this was. So the World Health Organization, the iodine organizations, they gathered together and said, hey, we can fix this. You know, there are ways that they could give iodine even like once or twice per year. It was quite inexpensive. And also they would fortify water in many regions. So it was done successfully. And it was this huge, huge public health win. So if we go forward just a few years, 23 years, from 1991 to 2014, the number of nations that were categorized as severely identification went from 112 down to zero. That was really cool. It was a huge, huge win. So it completely eradicated this problem that was holding back a billion people on the planet. This is like one of the biggest feel good stories that we've had for quite a while. Like a billion people's lives got better and it was a success. But. And here's the but. Because iodine is so exacting, many countries ended up overshot. They got more than they needed. So as the efforts went out to raise iodine in areas that were deficient, some of those same efforts caused there to be more iodine in places that had enough, and some caused there to be excess where there used to be deficiency. So by 2014, the number of nations that were severely deficient was zero, which is cool. But the number of nations categorized as at risk for thyroid disease due to iodine excess, well, that became 52. So now we're on the opposite end of that spectrum. We have 52 nations at risk for disease for too much iodine. As a generalization, iodine deficiency has the biggest impact on the youngest. So, yeah, children and toddlers are affected the most by that. Adults are not as strongly affected. Some can develop goiters. It's not as common, but most of the big complications occur early in life. Now, on the other side of it, when we see iodine excess, that's more commonly a problem in adults. It's less salient, less apparent in children, but it's the main known driver of ongoing chronic adult thyroid disease. And the US Is one of those nations considered at risk for iodine excess. Pretty much all of north and South America are in those categories. And even further studies have looked at a more detailed way at US Subpopulations. They've broken up the US in terms of our ages, our genders, our ethnicities, and looked at the iodine status in those various ways. And those most prone to thyroid disease are women in their 30s, 40s, 50s, 60s, and more. So with each decade, and especially in North America. And that's gone crazy over these last several decades, since around 1990. Well, that's when we entered into the stage of iodine excess. And we now know that in those subpopulations, 30 to 40% of women, 30 to 45% per the exact group, are at severe risk for thyroid disease due to iodine excess. So, yeah, you can have the average population high, which we do, and we can have some subpopulations that are not high, but we've got many that are. And not all 30, 45% of women get thyroid disease because not all are prone to it. But of those who are genetically prone to thyroid disease, the extra iodine is the main trigger that pushes them over the edge. And it's gotten very clear to researchers that this is the reason that we're seeing thyroid disease on the uptick in these populations, quite simply because of their ongoing excess iodine exposure. So, yes, iodine deficiency was a big problem in some parts of the world. Mild deficiencies do still happen. So deficiencies are categorized as severe, moderate, or mild. We now have no countries that's severe deficient, and we have seven countries categorized as mild, but all the severe deficiency is gone and now we have this risk of iodine excess that is affecting adults.
This is JJ with Ask the Health Expert. I do this five times a week, so make sure you never miss a show by going to subscribetojay.com.
Hello listeners, this is Anne Bogle, author, blogger and creator of the podcast what Should I Read next? Since 2016, I've been helping readers bring more joy and delight into their reading lives. Every week I take all things books and reading with a guest and guide them in discovering their next read. They share three books they love, one book they don't, and what they've been reading lately, and I recommend three titles they may enjoy reading next. Guests have said our conversations are like therapy, troubleshooting issues that have plagued their reading lives for years and possibly the rest of their lives as well. And of course, recommending books that meet the moment. Whether they are looking for deep introspection to spur or encourage a life change or a frothy page turner to help them escape the stresses of work, school, everything, you'll learn something about yourself as a reader and you'll definitely walk away confident to choose your next read with a whole list of new books and authors to try. So join us each Tuesday for what Should I Read Next? Subscribe now wherever you're listening to this podcast and Visit our website whatshouldireadnextpodcast.com to find out more.
More from JJ


Healthy Revisit: Heavily Meditated - Transforming Your Emotional Landscape with Dave Asprey






