We discuss three pivotal studies showing how natural light wavelengths positively influence health from all-cause mortality to visual perfomance to blood glucose control in Type II diabetics.

Jonathan Jarecki is a biomedical science sophomore with an interest in light and health, and host of Whole Health Podcast.

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TIMESTAMPS
2:41 Why UV Exposure Might Extend Life
7:28 Building The Sunbeam Score
15:11 Confounders, Vitamin D, And Validity
18:16 Mortality Findings And Dose Response
22:11 Melanoma, Incidence, And Trade-Offs
32:20 How Many Deaths Does Sunlight Prevent?
41:05 Policy, Vitamin D Pills, And Mechanisms
45:59 LEDs Versus Incandescent: The Vision Study
54:10 Infrared, Mitochondria, And Eye Function
1:05:40 Reimagining Indoor Light For Health
1:07:25 Daylight And Glucose Control In Diabetes
1:17:05 Circadian Gene Effects And Brightness
1:23:05 What Better Studies Should Test Next

Resources & Links:

Richard Weller et al: Risk–benefit balance of habitual ultraviolet exposure for cardiovascular, cancer, and skin cancer mortality: UK Biobank cohort study
- https://www.medrxiv.org/content/10.64898/2026.01.08.26343592v1

Glen Jeffrey et al: LED lighting (350-650nm) undermines human visual performance unless supplemented by wider spectra (400-1500nm+) like daylight
- https://www.nature.com/articles/s41598-026-35389-6

Natural daylight during office hours improves glucose control and whole-body substrate metabolism
- https://pubmed.ncbi.nlm.nih.gov/41418772/

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DISCLAIMER: The content in this podcast is purely for informational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Do not disregard professional medical advice or delay in seeking it because of something you have heard on this podcast or YouTube channel. Do not make medication changes without first consulting your treating clinician.

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