Do tv hosts come up with these tidbits of information to gain viewers?

Case in point: Dr Oz’s latest is, “Groundbreaking research shows that for every hour a day you spend sitting, your risk of death increases by 11%.” How can we know this? What kinds of studies could be done to prove it’s right? Think of all the jellies on here and the millions of people at desk jobs and none of them knowing they’re putting their lives at risk. It makes me feel like I should stand up when I’m on my computer.