> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/help-center/help-topics/data-api-sdk/provider-coverage-and-per-provider-data-availability/apple-body-composition-fields-missing.md).

# Why is Apple Health body composition data missing?

Apple Health does not have skeletal muscle mass or visceral fat as data types, so there is nothing to read or pass on for an Apple connection.

**Apple Health does not have skeletal muscle mass or visceral fat as data types**, so there is nothing to read or pass on for an Apple connection.

* **Lean body mass** is supported, but only appears when the source app writing into Apple Health records it.
* There is no separate body fat mass field. Body fat comes through as a **percentage** for every source, so absolute mass is derived from weight times that percentage.

For a full composition breakdown, a dedicated body-composition source like **InBody** is the right provider.