Enhance Wellness through Light and Mitochondria | Insights with Dr. Alexis Cowan

Cowan does this herself every day — she was observed sitting on grass outside the Lyon house in the morning before the podcast was recorded. She uses the 'Circadian' app to know precisely when UVA and UVB rise for her latitude. In New Jersey (40° N), sunrise is ~6:30 AM, UVA starts by 7:00 AM, and UVB arrives ~45–60 minutes later. Over 3,000 genes are regulated in a circadian fashion; the morning light stimulus triggers their activation cascade.

Cowan suggests using a CGM for a self-experiment: eat the same meal indoors under artificial lights on day 1, then the same meal outdoors in sunlight on day 2. She has personally confirmed that she sees a lower postprandial glucose response when eating outside or using a red light panel beforehand. The mechanism is mitochondrial pre-priming increasing flux capacity.

Cowan describes her own home: full-spectrum bulbs during the day, then all lights switched to red at sunset. She uses Iris software on her computer to filter blue light and screen flicker. Melatonin suppression requires both blue light content AND brightness; dim amber light has minimal suppressive effect. The goal is to allow the natural cortisol/melatonin cycle: melatonin rises at night, peaks, then wanes; cortisol rises in the morning in sync with natural light, mobilizing fat and glucose for the day.

Vitamin D is described as a 'biomarker for time spent outside,' not a therapeutic target to be fixed with supplements. Supplementation produces only D3, missing the other dozen+ photoproducts. Target is 40 ng/mL minimum (threshold to fully suppress PTH); 60 ng/mL for health optimization. Darker-skinned individuals need more sun to reach the same vitamin D level. Omega-3 to omega-6 ratio in diet also affects sunburn risk — ancestral 1:1 to 3:1 vs. modern 20:1 Omega-6 dominance makes skin more prone to inflammatory burning. Astaxanthin is noted as the best-validated supplement to reduce burning risk.

Cowan and Lyon did a cold plunge together at 54°F with the garage door open so morning sun could shine directly on them during the plunge. Cowan notes that doing the plunge outside or in natural light feels subjectively less stressful than indoors under artificial blue light. Cold is described as 'reciprocal medicine' to sun — in ancestral Northern environments, reduced winter sun was always accompanied by cold, and the two together provide the full mitochondrial stimulus. Cold without red light (e.g., cold plunge under blue LED lights) misses the synergistic component.

Cowan proposes that electrons from food, grounding, and sunlight (via melanin) are all equivalent inputs to the mitochondrial electron transport chain. The ancestral human was simultaneously grounded (no rubber shoes), sun-exposed (outdoors, minimal clothing), and receiving cold exposure — all three electron/mitochondrial sources stacked. Modern humans have eliminated all three simultaneously.

Alpha-MSH is one of the most tightly associated gene products with obesity. Both alpha and beta-MSH work in the hypothalamus to suppress appetite and increase energy expenditure — the opposite of what happens during caloric restriction alone. POMC is produced in skin, brain (hypothalamus), and immune cells. UVB exposure to both skin and eyes simultaneously provides the strongest stimulus. POMC also cleaves into alpha, beta, and gamma endorphins which elevate baseline dopamine. Cowan argues that widespread dopamine system burnout in modern society — leading people to seek junk food, junk media, and vices — is partly rooted in chronic UVB deprivation eliminating this endorphin/dopamine elevation pathway.

Cowan argues that mitochondria 'see' electrons, not macronutrients — food, grounding, and sun all deliver electrons to the ETC. Melanin's ability to split water (documented in papers going back decades) means sun exposure on melanated skin literally generates free energy. Grounding compounds this: bare feet on earth deliver electrons from the ground. The combination of sun + grounding + cold represents the full ancestral trifecta of electron sources that modern indoor living eliminates.

Cowan notes that midday sunlight is still over 50% red and infrared even at peak UV. Energy-efficient LED and fluorescent bulbs are devoid of red/infrared because that wavelength is 'wasted' as heat. The result is that indoor workers get continuous cytochrome c oxidase inhibition with no counterbalancing mitochondrial stimulation from red/infrared. Red light panels (630–670 nm and ~850 nm near-infrared) used in the background or therapeutically restore the missing stimulus.

Cowan explains the mechanism: when mitochondria are pre-stimulated with red light, their flux capacity increases, allowing faster clearance of glucose from the bloodstream. She proposes a practical n=1 experiment: wear a CGM, eat the same meal indoors under artificial light one day, then outdoors in sunlight the next day, and observe the difference. She has personally confirmed this effect.

Research shows that insufficient sun exposure may be responsible for 340,000 deaths in the US and 480,000 deaths in Europe per year, including increased incidence of breast cancer, colorectal cancer, hypertension, cardiovascular disease, metabolic syndrome, MS, Alzheimer's, autism, type 1 diabetes, and myopia. Cowan cites data that frequent sun exposure causes cancers with a 3% death rate (2,000 US fatalities/year — SCC/BCC) while preventing cancers with 20–65% death rates (138,000 US fatalities/year — breast, colon, blood cancers).

The coupled haplotype found in equatorial populations is optimized for energy production under year-round intense sunlight. The uncoupled haplotype found in Northern populations is better at generating metabolic heat in cold. Cowan suggests this is part of why Black and Latino populations in the US have worse health outcomes — they have coupled mitochondria that require high sun exposure but live at latitudes and in indoor environments where they never receive it.