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For a study published in the Proceedings of the National Academy of Sciences,
researchers used computer models that factored in the body's internal clock to compare
three scenarios: permanent standard time, which prioritizes more morning light,
permanent daylight saving time, which shifts light later into the evening, and the current
system of switching back and forth twice a year. 2

Their goal was to see how each time policy affects health outcomes like obesity and stroke.

• Findings showed clear benefits for standard time — The analysis revealed that
permanent standard time produced the largest reduction in both obesity and stroke
compared to the other policies. Specifically, the model estimated that obesity
prevalence would drop by about 0.78%, which equals millions fewer Americans
struggling with excess weight. Stroke rates also declined by about 0.09%,
preventing hundreds of thousands of new cases each year.

• Daylight saving time offered smaller benefits — Permanent daylight saving time
also lowered risks but to a lesser extent. The decreases were about 0.51% for
obesity and 0.07% for stroke. While still meaningful, these improvements fell short
of the stronger impact predicted under standard time.

https://media.mercola.com/ImageServer/Public/2025/November/PDF/permanent-standard-time-health-benefits-pdf.pdf