Today I opened HeathKit to find that it had reset all my data, unlinked all my apps, and reset my Healthkit home screen. What happened? This is a terrible bug. Has anyone else experienced this? 
For some people it happens about once a day. Try restarting the app. If that doesn't work, restart the phone. The data might come back.
What version of iOS 8? 8.1 has been solid for me re: Health App.
Where I see some oddness is if I click on a catagory's "Show All Data" or view under "Share Data" a specific source's raw data. Sometimes the graph goes into "No Data" mode, but graph eventually reappears (go back and forth between other categories; kill restart HA).
Same with me. No data at all, no links to 'my fitness pall' and locks up when I open the app.Today I opened HeathKit to find that it had reset all my data, unlinked all my apps, and reset my Healthkit home screen. What happened? This is a terrible bug. Has anyone else experienced this?![]()
Have the exact same issue. Ever since 8.0.1 I think. I've even done a new install Of 8.1 and a restore from backup and nothing.Mine has not worked for about 2 weeks or longer. I have given up on it.
App keeps freezing up. When it isn't frozen, no data ever shows up. Main screen keeps reseting to the "Dashboard Empty" screen. When I go into a setting, it shows "No Data".
Basically, the only thing that I have not tried is to reset the phone, erase all data and set up as new phone.
Today I opened HeathKit to find that it had reset all my data, unlinked all my apps, and reset my Healthkit home screen.