Nutrition
Bioelectrical Impedance Analysis
Bioelectrical impedance analysis estimates body fat via a safe low current—accurate for trends only when hydration, timing, and device stay consistent.
Bioelectrical impedance analysis (BIA) sends a low-level current through the body to estimate fat-free mass and body fat from resistance and reactance. Handheld scales, gym InBody units, and smart scales all use BIA with different equations and error bands.
Hydration, meal timing, and menstrual phase swing readings more than true fat change overnight. Use the same device, time of day, and bladder state for trends.
Common questions
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Is BIA accurate enough for fat loss tracking?
It tracks direction over weeks when protocol is fixed; absolute body fat percent can be off several points versus DEXA. Pair BIA with waist, photos, and performance—not one number alone.
Related terms
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