So, I've been using Apple's Health app, and I think it's wonderful.
My Apple Watch frequent enters my heart rate and steps-taken into the database, and I can manually enter other common things like my blood pressure and weight. Cool.
However, I don't see fields for everything that I may want to track.
For example, there aren't any fields to keep track of so-called 'healthy' fats, like DHAs / Omega-3 fatty acids.
I know that there are 3rd party apps that keep track of this sort of thing. But they seem to store that data in their own internal databases. I haven't found an app that can write data to the Health database. That is, unless the field already exists.
So, that has led me to wonder: Is Apple the sole provider/decider of the fields that can be used in their Health app?
Or, is it possible for 3rd party apps (or just a regular user like me) to create new fields that will work in the Health app?