Sun Avoiders Twice as Likely to Die as Sun Lovers
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- Rowan Jacobsen published "In Defense of Sunlight" (Scribner), arguing that UV exposure triggers multiple health benefits through mechanisms beyond vitamin D, including nitric oxide release that lowers blood pressure.
- Jacobsen notes that dietary vitamin D supplements have largely failed to reduce risks of obesity, diabetes, osteoporosis, heart attack, stroke, depression, respiratory infections, and colorectal cancer — suggesting sun exposure protects the body through other pathways.
- A 20-year study of 30,000 Swedish women cited in the book found that "sun avoiders" were approximately twice as likely to die as sun lovers over the study period.
- Jacobsen frames the risk calculus by noting that deaths from heart disease run roughly 100 times higher than deaths from skin cancer, arguing public health advice has misbalanced the trade-off.
- The book argues moderate sun exposure may calm overactive immune responses, potentially helping with multiple sclerosis and type 1 diabetes independently of vitamin D, while infrared wavelengths may stimulate mitochondrial function.
- Jacobsen credits the nitric oxide pathway with helping explain the cardiovascular benefits traditionally attributed to the Mediterranean diet, writing that combining sun exposure with the diet works better than either alone.
Why it matters: The book challenges a generation of dermatological caution by surfacing a 30,000-woman Swedish study linking sun avoidance to roughly double the mortality rate, alongside evidence that heart disease kills about 100 times more people than skin cancer. If even partly correct, it could shift public-health messaging toward weighing cardiovascular and immune benefits of moderate UV exposure against melanoma risk.
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