70% of Your Immune System Lives in Your Gut | Dr. Will Bulsiewicz
episodePreviously titled “Doctor Explains: Healing Your Gut Won't Work Until You Heal This” — renamed by the publisher on Aug 12, 2026
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What is the connection between gut health and the immune system?
70% of your immune system is in your gut mining. That gut barrier, that single layer of cells, it protects the immune system. But if it's weak, things can sneak across that are not supposed to be there. Your immune system gets activated and that's chronic low-grade inflammation. You can't have a war without total destruction, right? You're destroying everything around. When you're activating your immune system to fight an enemy, like if you just repaired the gut barrier, the enemy would have never got in in the first place. board-certified gastroenterologist, internationally recognized gut health expert, and best-selling author of many books, Dr. Will Bolsiewicz. There's absolutely 100% clear physiology that explains how our stress and our traumas ultimately will impact our gut.
And when they impact our gut, they will impact our immune system and create inflammation. You could be eating all the right things and doing everything you can in your control to eat healthier. But if you haven't healed the trauma of the past, you still might have a weaker gut microbiome, a weaker immune system because of that.
How does chronic inflammation affect overall health?
You could sleep. You could meditate. You could try to do things. But if you don't heal the trauma, then you're not actually going to be well. A lot of people are sick. A lot of people are sick. And I think they're sick and tired of feeling sick. And the gut health is usually one of the main reasons why people are sick. And they're not even aware of it. They might think there's some other symptoms that's causing them to be sick. But based on my conversation with you the last time, some of the stuff that you talk about in your book as well, that a lot of the root causes of inflammation come from the gut, from my understanding. Is that correct? A hundred percent. Really?
Yeah.
We could fully unpack that, but suffice it to say that in the three years that I spent preparing this book, and a big part of that was me diving into thousands of studies. The book has over 1400 citations that I will happily give to you. All you got to do is click and take a look and you'll see that I'm backing up my words. So, but I reviewed thousands of papers to basically try to understand what I see as the biggest health-related issue of our time, which is in one word, inflammation, right? Because the problem is, Louis, you could go to five different doctors for five different medical problems. that you don't necessarily think they're connected. You see them as separate issues, right? And they give you a symptoms-based approach, which is basically like, here's five different medicines.
And what they don't do is they don't take a moment to step back and tell you like, hey, there's a story here. There's a story because all of these issues are originating actually from the same place, which is chronic low-grade inflammation. So inflammation by itself, and we can dig into this, inflammation by itself, I don't wanna make it sound like inflammation is inherently bad.
What role does trauma play in gut health?
Inflammation is life-saving. when you actually need it. But what we don't need is a forever war inside of our body, which is what's happening with chronic low-grade inflammation, which is what's happening in America right now. So what is the difference between good inflammation and bad inflammation? Okay, so let me install some specific terms. So acute versus chronic. So acute inflammation, you get sick, right? You get exposed to some sort of bacteria or some virus. Guess what? Your immune system is going to step up to defend your body. That is the entire purpose of having an immune system, which is basically that's your little military and they're going to take care of you and they're going to clear out that infection.
It might take them a couple of days, but they'll get the job done and you move on with your life and you're nice and safe. That's acute inflammation. That's acute inflammation. So you get your fever, right? You get your fever, you have extreme fatigue. You might have other symptoms. Sometimes people like you get the flu, you get joint issues, right?
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Chapters
8 chapters
1
What is the connection between gut health and the immune system?
0:00–1:04
2
How does chronic inflammation affect overall health?
1:04–2:49
3
What role does trauma play in gut health?
2:49–4:05
4
What foods can help fortify the gut barrier?
4:05–7:26
5
How does stress impact gut health and immune function?
7:26–10:04
6
What are effective techniques for activating the parasympathetic nervous system?
10:04–14:38
7
How can spiritual healing influence gut health?
14:38–20:32
8
What are the four essential nutrients for gut health?
20:32–1:30:46
Speakers
3 identifiedMore from The School of Greatness
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