Body fat mass

The weight of the fat your body is carrying, in kilograms rather than as a share.

Weight alone cannot say whether a change was fat or muscle. Split into fat mass and fat-free mass, the same kilogram lost can be a good result or a bad one.

Read it together with fat-free mass: both falling usually means undereating, while fat falling with fat-free mass holding is the result most people are after. There is no target value, because it scales with your size.

Worth mentioning a rise that continues while your weight looks stable.