99. How Natural Light Improves Eye Health, Blood Sugar and Lowers All Cause Mortality | Jonathan Jarecki

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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