Vitamin D Expert: The Fastest Way To Dementia & The Dangerous Lie You've Been Told About Sunlight!
The Diary Of A CEO with Steven Bartlett
July 17, 2025
Is your daily routine ruining your health? Is THIS habit silently triggering dementia? Vitamin D Expert Dr. Roger Seheult reveals how sunlight exposure, caffeine intake, and sleep can impact cancer risk, accelerate dementia, and fry your dopamine brain!
Speakers Roger Seheult, Steven Bartlett
TopicsBusinessSociety & Culture
SPEAKER_1 (0:00)
The summer is heating up with Marvel Studios The Fantastic Four.
Roger Seheult (0:04)
Line them up, Johnny!
SPEAKER_1 (0:08)
On July 25th.
SPEAKER_3 (0:09)
Time to save the planet.
Roger Seheult (0:10)
What's the plan?
SPEAKER_1 (0:11)
Trust me, I hate that planet.
Roger Seheult (0:12)
That's a bad plan. Come on. That's a stupid plan.
SPEAKER_1 (0:15)
Prepare for Fantastic.
Steven Bartlett (0:18)
We will face this together as a family.
SPEAKER_1 (0:22)
Marvel Studios The Fantastic Four, First Steps, only in theaters July 25th. Wait, PG-13, some material may be inappropriate for children under 13 Get tickets now.
Roger Seheult (0:30)
He was literally two days away from dying. So this is a story where a 15-year-old boy was diagnosed with blood cancer, but he developed a flesh-eating infection in his lung. He wasn't gonna make it. So he has one request. He wants to go outside. And that's exactly what they do. And this was actually mind-blowing to me. After the second day, the infection is probably 60, 70% gone. And it became clear to me that sunlight has so many important benefits. For instance, if you're the bed closer to the window, you get discharged from the hospital faster.
Steven Bartlett (0:59)
So I want you to give me any information you have as it relates to light health. For example, do you recommend these kinds of things?
SPEAKER_3 (1:08)
Dr. Roger Seheult is a board-certified critical care physician who breaks down complex science into clear, life-saving advice.
Roger Seheult (1:15)
I see people at the very end of their lives, so I know what prevents them from getting this illness and how to extend life. So let's distill it down into eight pillars. The first thing, exercise. It reduces stroke. It reduces depression. Next, sunlight. Did you know that infrared light from the sun is able to penetrate up to about 8 millimeters and stimulate and upregulate melatonins, which prevent a lot of diseases like dementia, cardiovascular disease, diabetes.
Steven Bartlett (1:40)
What if you live in a cloudy country?
Roger Seheult (1:42)
There's some very actionable things that you can do, and we'll talk about that. Next one, water. For instance, people who use sauna are more likely to have less death from cardiovascular disease. Next, air. There are studies that showed that just going out one day a week can elevate our immune system and make us more relaxed. And then there's ****.
But finally, trust. This is something that can't be ignored because studies have shown that people who have a good faith and trust in a God are...
Steven Bartlett (2:11)
Quick one before we get back to this episode, just give me 30 seconds of your time. Two things I wanted to say. The first thing is a huge thank you for listening and tuning into the show week after week. It means the world to all of us and this really is a dream that we absolutely never had and couldn't have imagined getting to this place. But secondly, it's a dream where we feel like we're only just getting started. And if you enjoy what we do here, please join the 24% of people that listen to this podcast regularly and follow us on this app. Here's a promise I'm going to make to you. I'm going to do everything in my power to make this show as good as I can now and into the future. We're going to deliver the guests that you want me to speak to and we're going to continue to keep doing all of the things you love about this show.
SPEAKER_1 (2:52)
Thank you.
Steven Bartlett (2:57)
Dr. Roger Seheult, with the work that you do, what is it that you're aiming to accomplish?
Roger Seheult (3:03)
Outside of my clinical duties, it may be even part of that, I would like to clearly explain very easily graspable tools that can be implemented to make people live their best life. And it's specifically in terms of their health and their well-being.
Steven Bartlett (3:23)
And as we dig down into health and well-being, because that's quite a broad basket, what is it within health and well-being that you've spent your career, your life focusing on?
Roger Seheult (3:31)
So I'm a board certified internal medicine specialist. Then I did an extra three years of training here in the United States on pulmonary and critical care. So I deal with all of the issues that are related to the lungs and the critical care aspects. So if you are admitted to hospital and you're critically ill, you go to the intensive care unit, I'm the doctor that you see. So I'm putting in the lines, putting on vasopressors, intubating them. I worked in the clinic this morning.
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