In this episode of In Your Skin, we sit down with Dr Roger Seheult—pulmonologist, critical care and sleep physician, and co-founder of MedCram—to unpack the science-backed benefits of sunlight, infrared light, and circadian rhythm on our immunity, mood, skin, and long-term health. He shares an extraordinary hospital case of a teenage patient with a life-threatening fungal lung infection who turned a corner after daily time in the sun, and explains why light is more than “just vitamin D”. We explore how infrared light powers up your mitochondria, why getting outside (even in the shade, clothed, and sunscreened) still matters, and how simple habits like morning light exposure, strategic heat and cold, and the eight pillars of health (NEWSTART) can shift everything from sleep quality to metabolic health—and even longevity. If you’ve ever wondered how to balance Aussie sun safety with getting enough light for your brain, skin, and immune system, this one’s for you.

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0:00 – Welcome to the episode with Dr Roger Seheult (pulmonary, critical care, sleep; MedCram)

0:40 – The extraordinary case: teen with aggressive fungal lung disease improves after daily sunlight

4:25 – CT “gasp” moment: ~60–70% improvement in his remaining lung

5:55 – Hospitals, verandas, and windows: why patients near natural light recover faster

7:15 – Three big benefits of sunlight: circadian rhythm, mood, and metabolic health

9:35 – Infrared explained: the warmth you feel powers mitochondria and ATP (energy)

11:30 – Green spaces reflect infrared—why trees and grass supercharge your light dose

13:05 – Infrared sauna vs sunlight: why the full spectrum matters

14:45 – Vitamin D myths and realities: supplements help, but don’t replace the sun

17:40 – Is avoiding the sun more dangerous? Swedish and UK Biobank data on mortality

24:40 – Ageing & mitochondria: energy decline, oxidative stress, and melatonin made in cells

37:55 – The eight laws of health (NEWSTART) and what makes Dr Seheult feel confident in his skin

Connect with us on Instagram @inyourskin.podcast

Connect with Dr Roger Seheult @medcram

Articles:

https://onlinelibrary.wiley.com/doi/10.1111/joim.12496

https://www.sciencedirect.com/science/article/pii/S1353829224001564?via%3Dihub

https://www.sciencedirect.com/science/article/pii/S1011134422002342

https://www.nature.com/articles/s41598-025-09785-3

The content in this In Your Skin podcast is presented solely for general informational, educational, and entertainment purposes. If listeners use the information, it is at their own risk. It is not intended as a substitute for medical advice, or any other qualified professional, diagnosis, or treatment. Every person is unique and listeners should not disregard or delay in obtaining medical advice for any medical or health condition they may have and should seek the assistance of their healthcare professionals for any such condition.

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