In past blog posts, we’ve discussed the increased risks of heart attacks and strokes that result from sitting too much. Well, there’s more bad news. Those who sit the most, especially while watching television, are at an increased risk of several different cancers as well.
A large study published in the Journal of the National Cancer Institute looked at data from dozens of studies investigating correlations between sedentary behaviors and cancer. The authors found that people who were most sedentary had a 24% higher risk of developing colon cancer, a 32% higher risk of endometrial cancer (cancer of the womb), and a 21% higher risk of lung cancer compared to those who were least sedentary. In addition, when the authors looked at cancer risk in terms of total time spent watching TV, the results were even worse – a 54% higher risk of colon cancer for those watching the most TV and a 66% higher risk of endometrial cancer. Presumably, TV watching was probably associated with other unhealthy behaviors such as eating too much junk. Every 2 hours a day spent sitting increased the risk of colon cancer by 8% and endometrial cancer by 10%.
People who sat all day fared poorly even if they exercised every day. It seems that sitting/not moving in and of itself is really bad for the body – so much so that the 30 minutes on the treadmill, while healthy, does not cancel out the ill effects of being sedentary.
What does this mean for us? If you have a job where you literally sit all day in front of a computer, then you need to do your best to get up and move around several times a day (set a timer to remind you). If your office or company is more progressive, then perhaps they won’t mind a standing desk or even one with a treadmill (I know, I know, that’s probably not happening).
While you’re not at work, don’t plop down in front of the TV for hours. If you must watch TV, then work out while watching your favorite shows, and be mindful not to over eat.