You may want to stand up to read this.
The bad news was that there did seem to be a consistent relationship between hours spent sitting and an increased risk for colon and endometrial cancers.
People who spent the most time sitting during the day had a 24 percent increased risk of getting colon cancer compared to those who logged the least number of hours in a chair, according to the study.
Because the studies included in the review only looked at broad relationships, they can't prove that sitting, by itself, causes cancer. But the findings appeared to be remarkably consistent across studies, so Colditz thinks they should be taken seriously.