People who spend long hours sitting at desks may need to rethink their daily routines, as a new study suggests that prolonged, uninterrupted sitting could be linked to a higher risk of cancer-related death.
Published in PLOS Medicine, the study analysed health data from 91,292 participants from the UK Biobank. Researchers used activity trackers to measure participants’ sitting and movement patterns and followed them for more than 12 years to examine the connection between sedentary behaviour and cancer outcomes.
The study found that sitting or reclining continuously for more than 30 minutes at a time was associated with an increased risk of dying from cancer. Researchers also observed that every additional hour of prolonged sitting was linked to a 10% higher risk of cancer-related death.
However, the findings suggested that regular movement breaks could help reduce the potential risks. Participants who interrupted long sitting periods with physical activity showed better health outcomes compared with those who remained seated for extended durations.
Small Movements May Make a Difference
According to the research, replacing long periods of sitting with even light physical activity was associated with a lower risk of cancer death.
The study found that:
- One hour of light activity, such as slow walking or household tasks, was linked to a 12% lower risk of cancer-related death.
- Thirty minutes of moderate activity, such as brisk walking, was associated with an 8% lower risk.
- Just five minutes of vigorous activity daily was linked to a 22% lower risk.
Why Sitting Patterns Matter
The research suggests that the way people sit may be as important as the total amount of time spent sitting. Sitting for several hours without interruption appears to be more harmful than spending the same amount of time seated while regularly standing up and moving around.
This is particularly relevant for people with desk-based jobs, long commutes or lifestyles involving extended periods of inactivity.
Simple Ways to Reduce Sitting Time
Health experts recommend adding movement breaks throughout the day. Some simple habits include:
- Standing up every 30 minutes.
- Walking while attending phone calls.
- Stretching between meetings.
- Taking short walks during breaks.
- Using stairs instead of lifts when possible.
Even short periods of movement can help break up long stretches of inactivity.
Study Limitations
Researchers noted that the study shows an association between prolonged sitting and cancer-related mortality but does not prove that sitting directly causes cancer. Other factors, including lifestyle habits and existing health conditions, may also influence outcomes.
The researchers also highlighted that activity levels were measured during a limited period and did not separate different types of sitting, such as workplace sitting, television viewing or driving.
A desk job alone does not mean someone will develop cancer, but the study adds to growing evidence that reducing long, uninterrupted sitting periods is important for overall health. Making small changes, such as standing, stretching or walking regularly, can help create a more active daily routine.