A Bioelectrical Impedance Analysis (BIA) scale sends a low, safe electrical current through the body. The resistance (impedance) to this current is measured, as fat, muscle, and water conduct electricity differently. This data is used in algorithms to estimate body composition, providing a non-invasive way to track key healthspan markers like muscle mass and visceral fat over time.
Verdict
A useful tool for tracking body composition trends, not absolute values.
HEALTHSPAN IMPACT
Moderate
RISK LEVEL
Very Low
EVIDENCE GRADE
B
MONTHLY COST
$30 - $250
Protocol
- Use at the same time of day, under consistent hydration and fasting conditions.
- Measure 2-4 times per month to track long-term trends rather than daily fluctuations.
- Stand still with bare, dry feet placed correctly on the electrode pads.
Flags
- Accuracy is highly sensitive to hydration status, time of day, and recent exercise.
- Consumer-grade devices are best for tracking personal trends, not for absolute clinical accuracy.
- Contraindicated for individuals with pacemakers or other implanted electronic medical devices.
- Estimates can vary significantly between different brands and models due to proprietary algorithms.