A new Stanford-led study finds that switching permanently to standard time could prevent 300,000 strokes and reduce obesity in 2.6 million Americans by better aligning circadian rhythms with natural light. Researchers argue that the twice-yearly clock changes are the worst option for public health, ...

Switching clocks twice a year disrupts circadian rhythms in ways that harm health. Stanford scientists found permanent standard time would reduce obesity and stroke rates nationwide, making it the strongest option over permanent daylight saving time or seasonal shifts.