What if sunlight deserves a place in the health conversation alongside sleep, exercise, and nutrition? And how do we weigh its potential benefits against the very real risks of too much exposure?

In this episode, Norwegian GP and author Torkil Færø joins Dave and Georg to discuss The Sun Cure, his latest book on sunlight, circadian rhythms and health. Torkil describes how his views changed after years of assuming sunlight had little benefit beyond vitamin D. He now believes its influence reaches much further, affecting a range of processes in the body, though many questions remain open to research and debate.

Georg shares what happened during his three-week sunrise experiment in Vienna. He used Shadowmap to find places to watch the sun rise, then tracked his light exposure and several health measures. He reports that his heart rate variability rose by 13%, his resting heart rate fell by 8%, and his Whoop recovery score improved by 25%. Torkil explains what HRV can tell us about the body’s response to stress and recovery, while the conversation considers what wearable data can—and cannot—show.

The discussion also examines skin cancer and how risk is communicated. Torkil questions how to interpret the gap between rising melanoma diagnoses and comparatively stable mortality, suggesting that changes in detection and diagnosis may be part of the picture. Georg brings a personal perspective, describing his diagnosis and how it changed his relationship with the sun. Together, they explore the tension between advice to avoid sun exposure and research into sunlight’s wider effects.

They discuss sunscreen, shade and sunburn, as well as the importance of distinguishing between different kinds of evidence. The episode does not offer a simple answer to the skin cancer debate; it asks how medical guidance is formed, how strongly it is supported, and how it might account for both the harms and possible benefits of sunlight.

In this episode

• Why Torkil began questioning what he had been taught about sunlight
• Georg’s sunrise routine in Vienna and the health measures he tracked
• What heart rate variability may reveal about recovery and physiological stress
• Sunlight, circadian rhythms and their possible effects across the body
• Why melanoma diagnoses have risen, and how that compares with mortality trends
• The role that screening, detection and overdiagnosis may play in those figures
• Georg’s experience of skin cancer and his changing relationship with sun exposure
• How to think about sunscreen, shade, sunburn and individual circumstances
• Why the sunlight debate can produce sharply different readings of the research
• Whether wearable technology and light-based products could bring more attention to sunlight

Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.

Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.

Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?

Because sunlight isn’t optional. It matters.

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