About this episode
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 guidelinesWatch full episodes on: https://www.youtube.com/@seankimConnect on IG: https://instagram.com/heyseankim
