Episode 378: Red Light Therapy: Sunlight, Mitochondria, Sleep, and How to Use Devices Correctly with Ari Whitten

In this episode of the Flex Diet Podcast, I sit down with my good buddy Ari Whitten to talk all about red light therapy (photobiomodulation) and why it’s become so popular lately. We dig into how red and near-infrared light fits into an evolutionary sunlight context, why those wavelengths penetrate tissue differently, and how they can influence mitochondria, recovery, and performance. Ari also breaks down the confusing part most people miss: device choice and dosing aren’t one-size-fits-all, and “more power” isn’t always better, especially for sensitive areas like facial skin and the eyes. We also get into emerging research on sleep and melatonin (including intracellular melatonin), as well as practical considerations such as clothing and light penetration. Ari’s updated book, The Ultimate Guide to Red Light Therapy (2.0), is out now. Sponsors: Daily Fitness Insider Newsletter: https://flex-diet.kit.com/bfa1510fa8 Coming up: ISSN 2026: https://www.sportsnutritionsociety.org/ Available now: Grab a copy of the Triphasic Training II book I co-wrote with Cal Deitz here. Episode Chapters: 04:40 Catching Up Surf Talk07:34 Sunlight vs Red Light08:50 Photobiomodulation Basics11:04 Optical Window Explained15:41 Timing and Circadian Effects19:36 Sleep and Melatonin Links26:00 Clothing and Light Penetration27:36 Red Light for Eye Health29:48 Red Light for Eyesight30:47 Dose and Panel Pitfalls31:52 Deep vs Superficial Dosing35:02 Biphasic Response and Safety38:11 Heuristics for Panel Use40:46 Choosing the Right Device42:17 Optics Distance and Angles44:39 LED Density and Hot Spots46:47 Device Examples and Timing48:31 New Book and Wrap Up53:59 Host Outro and Disclaimer Flex Diet Podcasts you may enjoy: Episode 352: Mastering Heart Health: A Deep Dive into Preventive Cardiology with Dr. Michael Twyman YouTube: https://www.youtube.com/watch?v=hpdMnJSZMf8Episode 206: Advanced Recovery Tactics and more with elite athlete coach Justin Kavanauagh YouTube: https://www.youtube.com/watch?v=OTvYT5P3dWs&t=1s Connect with Ari: The Ultimate Guide to Red Light Therapy: https://www.amazon.com/Ultimate-Guide-Light-Therapy-Revised/dp/0593736559?ref_=ast_author_dpInstagram: https://www.instagram.com/ari.whitten/The Energy Blueprint: https://theenergyblueprint.com/ Get In Touch with Dr Mike: Instagram: DrmiketnelsonYouTube: @flexdietcertEmail: Miketnelson.com/contact-us