FitBit has your health data but not all the other data about you which Google is squirreling away. If you have an email address for Gmail against your Fitbit in

FitBit has your health data but not all the other data about you which Google is squirreling away. If you have an email address for Gmail against your Fitbit info then that health data is now available to be merged with all your other data. It can then be sold to anybody who offers enough for it or you will start to get ads for health products when Google starts analyzing your health info.