In general:
All your data stored in Fddb will not be passed on to third party providers.
Exceptions are:
1) Data transfer (export) from Fddb to Apple Health (iOS devices) is possible if you allow this in the Apple Health settings. This affects the following of your data:
- Macronutrients
- Micronutrients (vitamins and minerals)
- Body weight and body fat percentage
2) As of version 6.3.4 of the Fddb app for Android devices, it is possible to exchange health and fitness data between Fddb and Google Health Connect. A premium membership is required to use this pairing. The following data can be transferred to Health Connect:
- Total calories burnt
- Macronutrients
- Micronutrients (vitamins and minerals)
- Body weight
- Body fat
Please note the following helpful article:
What should be considered when linking Fddb with Google Health Connect?