In this episode, my guest is Dr. Sean Cain, PhD, a Harvard Medical School-trained expert in the impact of light on the human circadian system, a Matthew Flinders Professor at Flinders University, and Co-Founder and CEO of Circadian Health Innovations.
Today, he discusses how people differ more than fiftyfold in how sensitive their circadian systems are to evening light, that nearly half of modern homes are bright enough at night to suppress melatonin by fifty percent, and that most of us have no conscious awareness of any of it. We discuss the large observational studies he and his team have published linking bright days and dark nights to depression, type 2 diabetes, cardiovascular disease, and mortality, as well as his research on impaired light sensitivity in depression and why the amplitude of your circadian rhythm may matter more than its timing. We also discuss MiEye, the wearable light sensor his team developed, and practical changes to home and daytime lighting that anyone can make tonight.
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Timestamps
00:00 Intro
03:54 Dr. Sean Cain
04:42 Dr. Cain's Love for Science and Research
10:25 Understanding Circadian Rhythms: Anatomy and Function
10:56 Setting the stage: Circadian Biology, Rhythms, SCN, ipRGCs
16:20 Light, Circadian Entrainment, Mechanisms
19:57 High Sensitivity and Interindividual Variability in the Response of the Circadian of the Human Circa
22:02 Individual Sensitivity to Light and Circadian Disruption
27:22 Home Lighting, Sunset, LEDs, Fluorescents, Incandescents
27:37 Home Lighting and Its Effects on Circadian Health
33:46 Tools: circadian friendly home lighting
39:24 Population health outcomes; UK BioBank
39:29 Psychiatric Disorders
47:52 SPONSOR: Brighter Lamp
49:34 The Link Between Light Exposure and Mental Health
01:04:18 Light Exposure and Longevity: Key Findings
01:09:45 The Importance of Daylight for Health
01:17:41 Understanding Circadian Rhythms and Light Exposure
01:17:52 The Impact of Light on Mood and Self-Perception
01:23:39 Innovations in Circadian Health: My Eye Device
01:34:15 Jet Lag Management and the Jet Lag App
01:39:09 Support, YouTube, Spotify & Apple Follow, Reviews & Feedback, Social Media, Substack Newsletter
