Nutrition & DietSunlight Is a Nutrient — Here's How to Dose It for Longevity
Sunlight exposure is reframed as a biological necessity — not just a vitamin D source. Thomas DeLauer and guest Gerardo explore how UVA, UVB, and infrared wavelengths each trigger distinct physiological responses: UVA releases nitric oxide for cardiovascular and testosterone benefits, UVB synthesizes vitamin D, and near-infrared penetrates tissue to support mitochondrial function. The video covers optimal timing of sun exposure throughout the day, why morning light primes the body for midday UV, how artificial LEDs and blue light disrupt circadian rhythms and stress the nervous system, and why one Swedish study found sun avoidance carries mortality risks comparable to smoking. Practical strategies include astaxanthin as an internal photoprotectant and using full-spectrum lighting indoors.
