Where do body fat and BMI come from?

Body fat comes from a smart scale through Apple Health or Health Connect. Calsa does not ask you to enter it manually. Scale estimates are rough, so the trend across weeks is more useful than one reading.

BMI uses your weight trend and height. It cannot distinguish muscle from fat and is only a rough guide. You can hide it with Show BMI in You → Tracking. BMI and body fat are also hidden when relevant number or weight privacy choices apply.