#168 Beyond Vitamin D: How Sunlight Powers Your Mitochondria with Jonathan Jarecki—Part 2

In Part 2 of our conversation with Jonathan Jarecki, we move beyond the basic advice to “get more sunlight” and dive deeply into the emerging science of how light interacts with our mitochondria, cellular water, circulation, and circadian biology.

Jonathan begins by challenging the familiar explanation that ATP is simply the “energy currency” of the cell. Drawing from the work of researchers such as Gilbert Ling and Gerald Pollack, he explores another possibility: ATP may play a crucial role in organizing water and building exclusion-zone—or EZ—water inside the body.

We then examine how red and near-infrared light may support mitochondrial function. Jonathan explains proposed mechanisms involving cytochrome c oxidase, ATP synthase, electron flow through the mitochondrial electron transport chain, nitric oxide, and the production of subcellular melatonin. He also discusses why the absence of infrared light—and the abundance of isolated blue light—in modern indoor environments may place additional stress on our mitochondria.

The conversation also takes an honest look at red-light therapy devices. Are high-intensity panels always better, or could the lower intensity and balanced spectrum of natural sunlight be more biologically appropriate? Jonathan shares his concerns about extremely powerful devices, explains how distance can reduce intensity, and discusses simple alternatives such as incandescent bulbs and reflected near-infrared light.

We also explore the often-demonized ultraviolet portion of sunlight. Jonathan discusses vitamin D as a possible marker of sun exposure rather than the sole reason sunlight is associated with better health outcomes. He explains how UVA stimulates nitric oxide release, why that matters for blood pressure and circulation, and what research suggests about regular sun exposure, melanoma mortality, cardiovascular health, and other cancers.

Finally, Jonathan offers realistic ways to create a more light-supportive lifestyle even if you work indoors or are not ready for direct midday sun.

In this episode, we discuss:

• What mitochondria do and why they are essential to nearly every cell in the body
• Whether ATP is truly the body’s cellular energy currency
• Gilbert Ling’s ideas about ATP and cellular water
• Gerald Pollack’s research into exclusion-zone water
• How infrared light may affect electron flow and ATP production
• Cytochrome c oxidase, ATP synthase and the mitochondrial membrane potential
• How near-infrared light penetrates deeply into the body
• Why trees and green spaces create infrared-rich environments
• Whether infrared light can penetrate clothing
• Natural fibers versus synthetic fabrics
• The mitochondrial effects of isolated blue light
• Subcellular melatonin and the body’s antioxidant defenses
• Red-light therapy panels versus natural sunlight
• Why more intensity may not always produce better results
• Incandescent bulbs as a simple source of red and infrared light
• Why vitamin D supplements do not fully reproduce sunlight exposure
• UVA, nitric oxide, blood pressure and cardiovascular health
• The difference between chronic, regular sun exposure and intermittent burning
• Sun exposure, melanoma mortality and other cancer risks
• Why reductionist studies may fail to capture the full effects of sunlight
• Morning light and nighttime darkness as the foundations of circadian health
• Practical ways to improve your light environment at home and work

The science may be complex, but the central message is beautifully simple: our bodies developed in relationship with the full spectrum of natural light. Improving that relationship does not have to involve an expensive device or a complete lifestyle overhaul. It can begin with stepping outside in the morning, welcoming more natural light into the day, and allowing true darkness to return at night.

Connect with Jonathan Jarecki:
Instagram: https://www.instagram.com/jonathanjarecki/ 

X: https://x.com/jonathanjarecki 

Youtube/Podcast: https://www.youtube.com/@thesignalwithjonathanjarecki 

Substack: https://jonathanjarecki.substack.com/