Prompt: Measuring how close you are to death

OK, I am taking tonight off for reading. But I have a really interesting prompt, thanks to http://writingprompts.tumblr.com:

So what if you had a little device, like a Fitbit (which I love), that told you how risky a behavior would be? Or more specifically, put numerical values to how much closer to death anything you did-or ate-would bring you. How might society be affected by this kind of information? Insurance, social relationships, careers? What would your "mort" mean in your life?

I'd love to see what you come up with!