From the official blog post:
We are now concluding the trial, and are very grateful to all Nokia Beta Labs users for the feedback, suggestions and insights on Wellness Diary and for all the lessons we learned from it. At this time, however, we will not turn the service into a commercial product as we continue to focus on our core service offerings and to further increase our investments in location-based services as an area of competitive differentiation for Nokia products.
Even though we will discontinue the Wellness Diary trial, you will continue to have access to your data and will also be able to use the service if you wish to. From 1 January 2013 onwards, however, we won’t continue updating the service and there will be no connection to other services or support for it.
Here's Wellness Diary in action, just as a reminder, taken from our article on keeping fit with your smartphone: