Updated my iPhone 14 and lost all the data on fitness

Which update are you referring to? 

1. iOS Update? Which Version? Update your iPhone, iPad, or iPod touch - Apple Support
2. Carrier Update? Contact Carrier. Update your carrier settings on your iPhone or iPad - Apple Support
3. App Update? Which App? Contact App Developer? How to contact an app developer - Apple Support
4. Apple News Update? --> Read the latest headlines in the Apple News app - Apple ...

Same happened to me today. All data is gone. I think the iPhone 14 upgraded to 16.3.1 during the night.