Use Google Health? Not any more. Back in June Google announced that it will be shutting down Google Health, and it appears that it is following through with its original plans. At the stroke of midnight, you will no longer be able to access your Google Health information, but it will still be available for download as a .zip file for another year. On January 2nd, 2013, all Google Health data will be deleted from their servers, as stated on their FAQ.
For more information, hit these links below:
Google Health FAQ (English, US)
Blog post from June 24 announcing discontinue
About Google Health (Wikipedia English)