Basal metabolic rate

The calories your body would burn in a day at complete rest. Bioimpedance devices estimate it from your fat-free mass rather than measuring it.

It is the floor under your daily energy needs, and it explains why two people of the same weight can need noticeably different amounts of food.

It is an equation, not a measurement, so read the direction rather than the exact number. Because it is derived from fat-free mass it only moves when lean tissue does, and a value that looks low usually means less muscle rather than a slow metabolism.

Worth discussing a fall alongside fatigue and cold intolerance, with thyroid results.