The Jesse Chappus Show 692: We've Been Wrong About Sunlight... It's Not Just Vitamin D | Dr. Roger Seheult
Feb 17, 2026
Dr. Roger Seheult, quadruple board-certified physician and MedCram co-founder, explains sunlight beyond vitamin D. He breaks down ultraviolet, visible, and infrared effects. He covers safe UV timing, morning light for circadian health, light therapy options for winter, and how infrared boosts mitochondrial function. Practical tips for brief morning sun and indoor light choices are highlighted.
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Infrared Makes Up Most Solar Photons
- More than half of solar photons are infrared and they penetrate clothing and tissue deeply.
- Emerging trials link infrared exposure to faster ICU recovery and improved mitochondrial function.
Time Your Sun Exposure To Reduce Risk
- Avoid prolonged midday sun exposure without protection; cover up and avoid 10 a.m.–2 p.m. peak UV or use clothing/hat.
- Prefer morning or evening sun for benefits with lower UV risk.
Toronto PATH Keeps People Indoors All Winter
- Roger Seheult described Toronto's underground PATH allowing people to avoid going outside all winter.
- He used that example to illustrate how modern life reduces morning light exposure and increases seasonal affective disorder risk.