So I've been on a weight loss journey recently. For consistency I weigh myself at the same time in the mornings, after using the restroom but before eating. My scale is a Fitbit Aria, so for months I've just been manually logging weight in my Garmin Connect app and my Aria syncs to Google on its own and I don't really think about it. Yesterday, I weighed myself in the afternoon, knowing it was going to be an oddball and not planning on logging it in Garmin. Today I noticed it had that weight in Connect though! I know unequivocally I did not enter it, so Garmin must now be pulling data from the new Google Health app. Has anyone else seen anything pull across like this? It's nice to see they may be opening up syncing on some of these things!
Correct, but it's been connected for months and never pulled any information FROM Google, only pushed to it. That part is new.
Data is shared through a data "hub" of sorts.
Health Connect centralizes most health specs from across multiple android apps and is commonly implemented into scale apps, BP meter apps, etc...
There are limitations on what an app will share in Health Connect, and also what an app reads. This is determined by the specific health app itself. For example: Google Health will dump a ton of metrics into Health Connect, but Garmin is very limited on what it actually reads from it from other apps. (This is likely by design, by Garmin)
After comparing data accuracy from my old Pixel Watch to my new Garmin Fenix 8 Pro, the difference is quite significant. Garmin is absolutely more accurate. Stats (like VO2 max) may be calculated very differently and therefore, scores may not be "compatible" across equipment brands. (If I was a Garmin engineer, I would choose to ignore data sources that have a higher degree of inaccuracy as well, IMHO.)
However, why you are only seeing data from your scales now is anyone's guess. Any vendor involved may have fixed something, or simply integrated a few data feed from Health Connect. The main point being that Garmin may only just pull data from Health Connect and not directly from Google Health itself.
I also assumed you are running an Android phone. I have no idea what the equivalent of Health Connect would be on Apple.)