A new study from the United Kingdom has found that replacing just five minutes of sitting with vigorous exercise can reduce the risk of cancer-related death by 22%. The research, published in the journal PLOS Medicine, analyzed data from over 91,000 adults and highlights the importance of breaking up prolonged sitting with any type of movement.
Study Details and Key Findings
Researchers examined the relationship between sedentary behavior and cancer risk using data from 91,292 adults who wore wrist trackers for seven days to monitor their physical activity and sitting time. Participants were then followed for a median of 12.38 years to track cancer diagnoses and deaths. The study found that those who broke up sedentary time with light-intensity physical activity—such as slow walking or household chores like washing dishes—for at least an hour had a 12% lower risk of cancer-related death. Replacing 30 minutes of sitting with moderate activity (walking at 3-4 mph) reduced risk by 8%, while just five minutes of vigorous exercise (like brisk walking) led to a 22% reduction.
Prolonged Sitting Linked to Higher Cancer Risk
Sedentary behavior was categorized into two types: prolonged (sitting for more than 30 minutes without interruption) and interrupted (sitting for less than 30 minutes with movement breaks). Those with more prolonged sedentary behavior had a higher risk of developing breast, colorectal, esophageal, thyroid, and liver cancers, as well as a greater risk of dying from cancer. According to the Centers for Disease Control, about 25% of American adults are physically inactive, meaning they get no movement outside of work. Prolonged sitting is known to increase cardiovascular disease risk and decrease muscle mass, but this study adds strong evidence linking it to cancer.
Expert Commentary: Movement Reduces Inflammation
Dr. Heidi Prather, founder and medical director of the Hospital for Special Surgery’s Lifestyle Medicine Program in New York, who was not involved in the research, emphasized the importance of breaking up sitting time. “Just get up. That is the main message there,” she said. “Obviously, we’re all tied to a computer or a car or something that keeps us inactive, but just interrupting that with any type of activity seems to have, per their data, some very impressive results. Not just cancer death, but even risk of developing cancer.” Prather explained that movement helps reduce systemic inflammation, which is a key factor in chronic disease, including cancer. She noted that while 60% of cancer risk is genetic, 40% is related to lifestyle factors like diet, sleep, stress, and exercise.
Limitations of the Study
The study authors noted that participants, drawn from the U.K. Biobank, tend to have higher physical activity levels than the general U.K. population, which may limit generalizability. Additionally, the type of sedentary activity (e.g., commuting, working, watching TV) was not specified.
Practical Tips: Move More, Even in Small Ways
Prather advises setting small, easy goals to incorporate more movement into daily life. Examples include parking farther from the store, taking stairs instead of elevators, or getting off the bus one stop early to walk an extra two blocks. Even for those who exercise regularly, prolonged sitting remains a risk. “Get up, move because this study’s showing that breaking up long spouts of immobility is important,” Prather said. “It was pretty clear, if you have prolonged sedentary behavior, that’s as risky as not exercising.” The takeaway: any movement counts, whether it’s a 10-minute walk after lunch, taking a stair break at work, or doing a quick household chore. “We were meant to move ... we were not meant to sit,” Prather concluded.
