The Reverse Aging Club with Meredith Oke

196: Why Everyone Is Suddenly Talking About The Sun: In Defense of Sunlight

Aug 27, 2026
Rowan Jacobsen, award-winning science journalist and author of In Defense of Sunlight, explores how sunlight influences circadian rhythm, blood pressure, metabolism, immune function, mood and skin resilience. He recounts uncovering overlooked research, why public health emphasized skin cancer, and argues for light as a daily biological input with practical habits for balanced exposure.
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INSIGHT

Sunlight Does Much More Than Make Vitamin D

  • Sunlight delivers multiple systemic benefits beyond vitamin D, including metabolism regulation, immune modulation, nitric oxide release and circadian entrainment.
  • Rowan Jacobsen lists vitamin D, nitric oxide lowering blood pressure, metabolism activation and immune hormesis as distinct pathways backed by recent studies.
INSIGHT

Sunlight Releases Nitric Oxide To Lower Blood Pressure

  • UVA exposure mobilizes nitric oxide from skin stores and causes vasodilation, which can lower blood pressure and reduce cardiovascular risk.
  • Rowan points to Richard Weller's work showing blood-pressure effects that could outsize skin-cancer risk at a population level.
INSIGHT

Treat Light As A Daily Nutrient

  • Treat light as a daily nutrient comparable to food, water and oxygen because photons penetrate skin and tissues and act as biological inputs.
  • Rowan illustrates that photons pass through eyelids and skin, meaning sunlight is absorbed and used by molecules across the body.
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