Sunlight might be medicine’s most overlooked intervention.
Dr. Roger Seheult, a critical care physician and pulmonologist, has witnessed something remarkable that’s changing how he thinks about healing.
In a recent conversation, he shared a story so compelling it could revolutionize hospital care—and explained why stepping outside might be more powerful than any supplement bottle.
What he’s discovered goes far beyond vitamin D, touching everything from COVID-19 survival to why certain hospital patients recover faster simply based on which bed they’re assigned.
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The Dying Wish That Defied Medical Predictions
Amy Hanmeyer’s 15-year-old son was given two days to live.
Diagnosed with lymphoblastic leukemia—a blood cancer—he’d already endured chemotherapy and lost his left lung to a flesh-eating fungal infection. Now the infection had spread to his only remaining lung.
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Doctors at the Minnesota tertiary care hospital held a family conference in June 2024. They’d exhausted every option. The recommendation: make him DNR—do not resuscitate.
When asked what he wanted to do with his final days, the boy had one simple request.
I want to go outside. I just want to go outside.
Hospital staff moved heaven and earth to fulfill this dying wish. They wheeled his bed outside, BiPAP machine and all, fully expecting it to be his final comfort—not a cure.
What happened next shocked everyone.
The Impossible Recovery
After the first day outside, his white blood cell count started dropping—a sign the infection was retreating.
By day two, it dropped further. His oxygen requirements decreased. Nothing else in his treatment had changed.
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He’d spent six weeks in the hospital receiving powerful antifungal medications—amphotericin B and posaconazole—yet continued declining. The only variable: sunlight exposure.
By day five, he was off the BiPAP machine entirely, breathing with just a nasal cannula.
Doctors ordered another CT scan, expecting the worst. Instead, they found the lung disease was 60-70% gone. Some staff swore under their breath in disbelief.
The boy went home. He recently received his Make-A-Wish grant and continues cancer treatment—alive against all odds.
Why Sunlight Isn’t Just About Vitamin D
Dr. Seheult is quick to dispel a dangerous myth.
A very big misconception that people have is that sunlight equals vitamin D. And therefore, if you take a vitamin D supplement, you don’t need to go in the sun. This is really something that’s now being debunked.
He supplements with vitamin D himself and recommends it. But sunlight delivers benefits no pill can replicate.
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- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
The breakthrough came from a 2019 paper by Russell Reiter and Scott Zimmerman that fundamentally changed how Dr. Seheult understood light’s interaction with human biology.
Infrared Light Penetrates Where UV Can’t
Sunlight contains multiple wavelengths. Ultraviolet B rays create vitamin D but can’t penetrate deeply—they barely get past skin level.
Infrared light operates differently. Think about physics: low-frequency bass music from a neighboring car penetrates your vehicle easily. Thunder from miles away reaches your ears as a deep rumble.
Long wavelengths travel far and penetrate deep.
According to Zimmerman’s research, infrared light from the sun penetrates approximately 8 centimeters into human tissue—reaching organs, muscles, and critically, mitochondria.
The Mitochondrial Connection
Remember high school biology? The mitochondria is the powerhouse of the cell.
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What textbooks didn’t mention: as we age, mitochondrial output drops by roughly 70%.
Can you imagine running your house on 70% less energy? How fundamentally that would change what happens in your house? Like, you could not run the laundry the same way. You could not run the microwave and the laundry at the same time.
When mitochondria fail in liver cells, fatty liver develops. In heart cells, congestive heart failure. In brain cells, dementia.
Dr. Seheult observed this pattern repeatedly during COVID-19. Patients dying in his ICU weren’t primarily respiratory cases—they had obesity, heart disease, kidney disease, dementia. All conditions rooted in mitochondrial dysfunction.
Oxidative Stress: The Engine Overheating
Mitochondria are like car engines. Engines produce motion but generate heat as a byproduct. Without a cooling system—radiator, oil pan, water pump—the engine fails.
Mitochondria face the same challenge, except instead of heat, they produce oxidative stress. Left unchecked, oxidative stress destroys mitochondrial function, leading to disease.
The body’s solution? Mitochondria produce their own cooling system: melatonin.
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Not the brain-produced melatonin that makes you sleepy. This is cellular melatonin—manufactured directly in mitochondria as a powerful antioxidant.
And here’s where sunlight becomes crucial: infrared radiation stimulates and upregulates melatonin production in mitochondria, essentially upgrading your cellular cooling system.
The COVID-19 Revelation
Two observations during the pandemic crystallized this understanding for Dr. Seheult.
First, SARS-CoV-2 attacks the ACE2 receptor—which happens to play a critical role in mitigating oxidative stress. The virus essentially sabotages your mitochondrial cooling system.
Imagine everyone climbing a steep hill called COVID-19. Healthy people have cool-running engines. Those with chronic diseases already have engines running hot—high oxidative stress from dysfunctional mitochondria.
COVID forces everyone’s engine to run hotter by blocking ACE2 receptors. Healthy people make it over the hill. Those with overheating engines—diabetes, dementia, kidney disease—break down.
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- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
This makes perfect sense to me why I wasn’t seeing what they were predicting, which is respiratory patients coming into the ICU. Who was I seeing in the ICU? I was seeing people with dementia, diabetes, kidney disease.
The Vitamin D Paradox
Second, early pandemic data showed higher vitamin D levels correlated with survival. Low vitamin D meant higher death risk.
Naturally, doctors supplemented patients with vitamin D. Results were disappointing—it didn’t significantly improve outcomes.
Why? Because vitamin D was just a marker of sunlight exposure, not the active therapeutic agent. People with high vitamin D spent time outside—exposing themselves to the infrared light that actually protects mitochondria.
Pills can’t replicate that.
Hospital Design That Heals
Research backs up what Amy’s son experienced:
- Patients in beds closer to windows get discharged faster
- Hospital rooms with larger windows receive better patient satisfaction surveys
- Better surveys mean better reimbursement for hospitals
Dr. Seheult is now working with three different hospitals to get patients outside more regularly. The biggest barrier isn’t logistics—it’s staffing.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
This is what we used to do. When we built hospitals at the turn of the century, we had hospital rooms where beds could be taken out onto the veranda and people could get sunlight.
He envisions a return to that model—because it’s literally a win-win-win for outcomes, patient experience, and hospital finances.
Beyond Hospitals: The NEWSTART Framework
Sunlight is just one pillar in Dr. Seheult’s approach to longevity and wellness. He follows the NEWSTART framework developed by Weimar University:
- Nutrition
- Exercise
- Water
- Sunlight
- Temperance (avoiding toxins)
- Air (with natural microflora)
- Rest (daily sleep and weekly breaks from work/devices)
- Trust (faith and stress management)
Each element supports the others, but sunlight stands out as what Dr. Seheult calls “the lowest-hanging fruit”—the easiest intervention with outsized benefits.
Making Sunlight Work for You
Getting outside isn’t complicated, but consistency matters.
Morning and late afternoon sun provide infrared light without excessive UV exposure. Even 15-20 minutes daily can influence mitochondrial function.
For those unable to get outside regularly—whether due to mobility issues, climate, or work constraints—red light therapy devices may offer partial benefits, though they can’t fully replicate natural sunlight’s spectrum.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Dr. Seheult supplements with vitamin D and recommends others do too. But he’s clear: supplementation supports sunlight exposure; it doesn’t replace it.
Rethinking Recovery
Amy’s son didn’t just survive—he thrived against impossible odds because his final wish happened to align with cutting-edge mitochondrial science.
His story isn’t an anomaly. It’s a window into how profoundly light influences healing at the cellular level.
As Dr. Seheult puts it, we’ve built modern medicine around pills, procedures, and protocols. We’ve forgotten that some of nature’s most powerful therapies—sunlight, rest, movement—cost nothing and require only intention.
Perhaps the future of healthcare isn’t found in newer drugs or more sophisticated technology.
Perhaps it’s found by simply opening the door and stepping outside.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
