# Vitamin D Expert Busts The Big Myth About Sunlight! Can It Cure Dementia?

Page: https://stenobird.com/podcast/growth-minds-with-sean-kim-349068/vitamin-d-expert-busts-the-big-myth-about-sunlight-can-it-cure-dementia
Text version: https://stenobird.com/podcast/growth-minds-with-sean-kim-349068/vitamin-d-expert-busts-the-big-myth-about-sunlight-can-it-cure-dementia.md
Podcast: [Growth Minds with Sean Kim](https://stenobird.com/podcast/growth-minds-with-sean-kim-349068)
Published: 2026-01-16T12:00:00+00:00
Episode link: https://podcasters.spotify.com/pod/show/growth-minds/episodes/Vitamin-D-Expert-Busts-The-Big-Myth-About-Sunlight--Can-It-Cure-Dementia-e3dmhl6
Audio file: https://anchor.fm/s/1ebb5710/podcast/play/114033766/https%3A%2F%2Fd3ctxlq1ktw2nl.cloudfront.net%2Fstaging%2F2026-0-15%2F416165318-44100-2-1d31c93d9043d.mp3
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JSON: https://stenobird.com/v1/public/podcasts/growth-minds-with-sean-kim-349068/episodes/vitamin-d-expert-busts-the-big-myth-about-sunlight-can-it-cure-dementia
Duration seconds: 5400

## Resource

Dr. Roger Seheult is a physician specializing in pulmonary and critical care medicine and is widely recognized for his expertise on vitamin D and sunlight’s role in human health. He is the co-founder of MedCram, where he explains the science behind vitamin D, immune function, sleep, and metabolic health in a clear, evidence-based way. Dr. Seheult is known for translating complex medical research into practical guidance that helps people optimize health and resilience. In our conversation we discuss: (0:00) – Sunlight benefits beyond vitamin D (3:39) – Can sunlight increase lifespan (6:36) – Sunlight versus outdoor activity benefits (13:20) – Best time of day for sunlight (19:52) – Morning cortisol: wake time versus sun timing (21:01) – Is sunlight best cortisol trigger (22:56) – Front-loading cortisol and workout timing (27:26) – Blue light effects on circadian rhythm (33:36) – Why earlier sleep improves energy (39:12) – Can late sleepers fully adapt (40:26) – Ideal sleep and wake schedule (44:01) – Can weekend sleep make up deficits (45:39) – Daily melatonin use safety (51:04) – Recommended sleep supplements (1:00:30) – Are chronotypes fixed or flexible (1:00:53) – Sunscreen risks and benefits (1:05:39) – Face sunscreen with body sun exposure (1:08:38) – Sun exposure needed for vitamin D (1:11:44) – Optimal vitamin D dosage and toxicity (1:14:05) – Other key immune system boosters (1:19:47) – Hot and cold therapy for immunity (1:25:52) – Sauna and cold exposure guidelines Watch full episodes on: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠https://www.youtube.com/@seankim⁠⁠⁠⁠⁠⁠⁠⁠ Connect on IG: ⁠⁠⁠⁠⁠⁠⁠https://instagram.com/heyseankim

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