Rowan Jacobsen
Award-winning author and science journalist whose books, features, and talks explore science, nature, health, food, adventure, and technology; author of “In Defense of Sunlight: The Surprising Science of Sun Exposure.”
Modern Indoor Life Has Replaced Sunlight With a Narrower Light Diet
Rowan Jacobsen argues that modern indoor life has stripped away much of the broad, intense light spectrum humans historically received outdoors, leaving people not just with less brightness but with a different “light diet.” His case is that sunlight should be understood as a dose-dependent biological input—ultraviolet, visible and infrared wavelengths acting through different mechanisms—rather than only as a skin-cancer risk or a source of vitamin D. He does not dismiss that risk, especially burns and susceptible skin types, but argues the larger public-health question is how to restore moderate, regular outdoor light without treating sun exposure as harmless.
Sunlight Advice Should Weigh Total Mortality, Not Skin Cancer Alone
Author Rowan Jacobsen tells Russ Roberts that public-health advice has treated sun exposure too narrowly as a skin-cancer problem, when the relevant question should be total health and mortality. Jacobsen accepts that sunlight can cause skin cancer and that burns should be avoided, but argues that moderate exposure may also confer benefits, especially through mechanisms such as nitric oxide and cardiovascular effects. Roberts presses the limits of the evidence, leaving the case as a tradeoff rather than a reversal: sunlight is risky, but zero exposure may not be the safest default.