Many people believe daylight saving time helps improve health by giving us more daylight in the evening. The idea seems simple. More sunlight after work should encourage people to walk, exercise, and spend more time outdoors. However, new research suggests that changing the clocks may not actually lead to more physical activity.
A recent study found that daylight saving time does not significantly increase the number of steps people take each day. While the time change may shift when people are active, it does not appear to raise overall movement levels. These findings add an important perspective to the ongoing debate over whether seasonal clock changes are truly beneficial.
Researchers analyzed Fitbit data from 1,157 adults living in four U.S. states: Arizona, Colorado, New Mexico, and Utah. Arizona was especially useful for comparison because most of the state does not observe daylight saving time, unlike the other three states.
By comparing people in states that changed their clocks with those in Arizona, researchers were able to study the effects of daylight saving time in a real-world setting.
The team reviewed data from time changes between fall 2021 and spring 2023. They focused on activity levels during the week before and the week after each clock change.
The results showed that people generally took the same number of daily steps regardless of whether daylight saving time or standard time was in effect.
This means that while the clocks changed, people’s total physical activity did not.
Although total daily movement stayed about the same, researchers noticed that the timing of physical activity shifted.
When clocks moved forward in spring, participants tended to walk more during the evening and less earlier in the day.
When clocks moved back in fall, morning walking increased while evening walking decreased.
For example, morning activity during fall rose by about 202 steps, while evening activity dropped by around 180 steps.
This suggests people adjusted their schedules to match available daylight, but they did not necessarily become more active overall.
The study also found differences based on personal habits.
People who usually exercised in the morning took advantage of the fall shift to standard time. They increased their morning walking when sunrise came earlier.
Those who preferred evening exercise did not significantly increase their steps after the spring move to daylight saving time, even though they had more daylight later in the day.
Participants without a strong morning or evening preference simply adapted to daylight patterns. They walked more in the morning during fall and more in the evening during winter.
The findings challenge a common argument in favor of daylight saving time. Many supporters claim extra evening sunlight promotes better health through increased outdoor activity. This study suggests the benefit may be smaller than expected, at least when measured by daily step counts.
Instead of increasing exercise, daylight saving time may simply change when people move.
That distinction is important for policymakers considering whether to keep or remove seasonal time changes.
Researchers also noted that not everyone has the flexibility to adjust their schedules.
Some people may have:
For these groups, daylight saving time may create inconvenience rather than benefit.
Future studies may help determine whether clock changes impact certain populations more than others.
Daylight saving time has long been controversial. Supporters argue it can:
Critics say it can:
This new study adds evidence that physical activity may not be a strong reason to continue changing the clocks.
Whether clocks move forward or backward, staying active depends more on habits than daylight alone. Here are practical ways to maintain movement year-round:
Choose a consistent time for walking, whether morning, lunch break, or evening.
On dark or rainy days, try treadmills, gyms, or home workouts.
Take stairs, park farther away, or use short walking breaks during the day.
Time changes can affect sleep quality. Good rest supports energy and exercise motivation.
Adjust activity times with seasons rather than relying on the clock.
Daylight saving time may change when people walk, but it does not appear to make them walk more. According to this new research, total daily steps remained largely unchanged before and after clock changes.
For anyone hoping the extra hour of evening sunlight automatically leads to better fitness, the answer may be more complicated. Personal routine, motivation, environment, and schedule likely matter far more than moving the clocks.
As discussions continue around ending seasonal time changes, studies like this help separate assumptions from measurable outcomes.
This article is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment. Research findings reflect general trends and may not apply to every individual. Always consult a qualified healthcare professional for personalized health guidance.
Most Accurate Healthcare AI designed for everything from admin workflows to clinical decision support.