A recent study highlights a concerning link between a common daily habit and an increased risk of cancer.
Researchers in Scotland conducted an extensive study, observing health data from a large group of adults who wore activity monitors for a week. These individuals were then tracked for more than a decade, providing one of the most comprehensive studies of its type.
On average, people spend between six and ten hours each day engaging in sedentary activities, whether it be watching television or sitting at a desk for work.
While it’s well-established that prolonged inactivity can lead to obesity, diabetes, heart disease, and osteoporosis, the new findings suggest potentially even more severe outcomes.
The study indicates that extended periods of sitting without interruption may be associated with a greater risk of developing and dying from various cancers.
According to the research, every additional hour of uninterrupted sitting is linked to a nine percent increase in the risk of cancer mortality, along with a three percent rise in the initial development risk. Specifically, cancers associated with obesity, such as pancreatic and colon cancer, showed a five percent increase in risk.
Conducted by the University of Glasgow, the study analyzed data from 91,292 adults part of the UK Biobank database, all aged between 37 and 73, with no prior cancer history.
Participants were equipped with wrist monitors 24/7 for a week, enabling precise tracking of their daily activities.
Researchers employed a machine-learning program to classify data into sedentary behavior, light activity, and moderate to vigorous exercise categories. Importantly, they differentiated ‘prolonged’ sedentary behavior, defined as at least 30 minutes with 90 percent of the time spent sitting, from ‘interrupted’ sedentary time, which included interspersed movement.
Over a 12-year period, researchers monitored participants for the occurrence of various cancers, including breast, colorectal, pancreatic, kidney, liver, and thyroid cancers.
The research team suggests that prolonged sitting may cause inflammation throughout the body, creating a conducive environment for cell DNA damage and mutation into cancerous tumors.
Inactivity is also known to exacerbate insulin resistance, a significant factor in type 2 diabetes, which has been independently linked to tumor growth.
The study offers a positive outlook, suggesting that small lifestyle changes can have a notable impact. Replacing 30 minutes of sitting with light activity, like walking, can reduce the risk of cancer death by 18 percent.
Switching the same amount of time to moderate activities, such as brisk walking or cycling, led to an eight percent decrease in cancer death risk. Just five minutes of vigorous exercise daily, like running or swimming, was associated with a four percent reduction in overall cancer risk.
“Our findings suggest that the health effects of sedentary behaviour may depend not only on total sedentary time, but also on whether that time is accumulated in prolonged bouts or interrupted by activity,” the study authors noted.
While the researchers caution that their findings show association rather than causation, they emphasize the results bolster growing evidence in favor of incorporating light movement into daily routines.