How to Read Your InBody Results: Body Fat, Muscle and Visceral Fat

InBody measures body composition, not just weight. A regular scale gives you one number but can't tell how much of it is muscle, fat and water. Two people at the same weight can have very different bodies and very different health risk, which is exactly why composition matters more than kilograms.

The device uses segmental multi-frequency bioimpedance: it sends a weak current through the body and estimates composition from the electrical response. It does not directly measure fat or muscle, and hydration, food, recent training and other conditions can shift the estimate. Use it primarily to follow a trend under comparable conditions, not as a diagnosis or an absolute gold standard.

PBF is an estimate of body-fat percentage. Its reference band varies with sex, age, population and the configuration of the particular result sheet. Read the band printed on your own report and do not turn one internet table into a universal health target.

Visceral fat is different from the subcutaneous fat you can pinch. First check whether your sheet reports Visceral Fat Level (VFL) or Visceral Fat Area (VFA), because they are not interchangeable. InBody uses VFL below 10 or VFA below 100 cm² as adult reference points; either remains an estimate for context and trend, not a diagnosis.

The most common mistake is confusing SMM with LBM. SMM is the device's estimate of skeletal muscle mass, not a direct weighing of muscle. LBM and SLM (fat-free and soft lean mass) also include body water, so a change in either does not by itself prove muscle gain or loss.

Compare SMM and segmental estimates over time under similar conditions. A side-to-side difference is a prompt to check technique, injury history and movement function; the printout alone cannot diagnose a problem or prescribe corrective exercise. The sheet's BMR is also a model-based estimate tied to estimated fat-free mass, not a direct metabolic test or a measure of cardio fitness.

This is where most guides stop and where the value actually starts. There is no automatic plan derived from one result. Lower estimated SMM or higher PBF can prompt a discussion about strength training, conditioning, food and recovery, while a segmental difference should first prompt a check of measurement conditions, movement function, technique and injury history rather than an automatic corrective prescription.

For training feedback, re-measuring roughly every 4–6 weeks can be practical, but comparable conditions matter more than the exact calendar. Measure at a similar time, before food, exercise and a shower or bath, and follow the operator's instructions. If you have a pacemaker or another implanted electrical device, do not proceed without following the model warning and your treating clinician's advice. During pregnancy, follow the specific model's instructions and your clinician's advice.

Phase angle and ECW/TBW are supporting bioimpedance outputs, not stand-alone diagnoses. Their meaning depends on the device, population, age, health and measurement conditions. Persistent swelling, breathlessness or other symptoms belong with a clinician; a trainer should not infer inflammation or organ disease from one ratio.