(HealthDay News) — Prolonged television (TV) viewing and other sedentary behaviors are associated with increased risks of some cancers, according to research published online June 16 in the Journal of the National Cancer Institute.
Daniela Schmid, PhD, and Michael F. Leitzmann, MD, DrPH, of the University of Regensburg in Germany, performed a meta-analysis using data from 43 observational studies involving 68,936 cancer cases. The authors sought to assess the association between sedentary behaviors and cancer risk.
For the highest vs. the lowest levels of sedentary time, the researchers observed increased relative risks (RRs) for colon cancer associated with TV viewing time (RR, 1.54; 95% confidence interval [CI], 1.19–1.98), occupational sitting time (RR, 1.24; 95% CI, 1.09–1.41), and total sitting time (RR, 1.24; 95% CI, 1.03–1.50). For endometrial cancer, increased relative risks were associated with TV viewing time (RR, 1.66; 95% CI, 1.21–2.28) and total sitting time (RR, 1.32; 95% CI, 1.08–1.61). Overall sedentary behavior was positively associated with increased risk of lung cancer (RR, 1.21; 95% CI, 1.03–1.43). No association was found between sedentary behavior and risk of cancers of the breast, esophagus, non-Hodgkin’s lymphoma, ovaries, prostate, rectum, renal cell, stomach, or testes.
“Prolonged TV viewing and time spent in other sedentary pursuits is associated with increased risks of certain types of cancer,” the authors write.