Being a couch potato can raise your risk of developing cancer!
Physical inactivity has been linked with increased risk of diabetes, obesity and cardiovascular disease, and according to a new study a sedentary lifestyle can also raise the chances of developing certain cancers.
When the highest levels of sedentary behaviour were compared to the lowest, the researchers found a statistically significantly higher risk for three types of cancer – colon, endometrial, and lung.
To assess the relationship between TV viewing time, recreational sitting time, occupational sitting time, and total sitting time with the risk of various cancers, Daniela Schmid and Michael F Leitzmann, of the Department of Epidemiology and Preventive Medicine, University of Regensburg, Germany, conducted a meta-analysis of 43 observational studies, including over 4 million individuals and 68,936 cancer cases.
Data in the individual studies had been obtained with self-administered questionnaires and through interviews.
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When the highest levels of sedentary behaviour were compared to the lowest, the researchers found a statistically significantly higher risk for cancer.
Moreover, the risk increased with each 2-hour increase in sitting time, 8 per cent for colon cancer, 10 per cent for endometrial cancer, and 6 per cent for lung cancer, although the last was borderline statistically significant.
The effect also seemed to be independent of physical activity, suggesting that large amounts of time spent sitting can still be detrimental to those who are otherwise physically active.
TV viewing time showed the strongest relationship with colon and endometrial cancer, possibly, the authors said, because TV watching is often associated with drinking sweetened beverages, and eating junk foods.
“That sedentariness has a detrimental impact on cancer even among physically active persons implies that limiting the time spent sedentary may play an important role in preventing cancer,” researchers wrote in the study published in JNCI: Journal of the National Cancer Institute.