Samsung Health is an app that tracks calories eaten / burned among other things, it has allot of 3rd party devices that are able to sync in data (such as calories burned from a smart watch).
Linking the Oculus Move to this app would make the Oculus much for attractive to customers who buy a VR for weight loss.
Personally, I track caloric intake using a spread sheet, I might use VR for exercise, but I got into it for the ability to enter other worlds in a way no flat screen game, movie, tv show, or book can replicate. The fact it's an amazing tool for getting into better shape is just a happy side benefit to me. Speaking of entering other worlds...