STEM与日常科技·英语30篇（7）
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Why Smart Scales Detect Hydration Levels Through Foot Electrodes
智能体重秤为何通过足部电极检测身体含水量
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Smart scales send a safe, low-voltage electrical current through your feet using stainless-steel electrodes.
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Since water conducts electricity better than fat or muscle, the current's speed reveals body hydration status.
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The scale measures resistance (impedance) across multiple frequencies to distinguish intracellular from extracellular fluid.
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Algorithms cross-reference impedance data with height, age, gender, and recent activity logs.
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Results update daily in companion apps, showing trends rather than one-time snapshots.
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Calibration requires bare feet and consistent timing—ideally before breakfast and after resting.
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This bioelectrical impedance analysis (BIA) method is FDA-cleared for home wellness use.
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It cannot diagnose medical conditions but helps users notice dehydration patterns early.
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Environmental humidity and skin temperature affect readings, so advanced models auto-compensate using onboard sensors.
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Researchers validated accuracy against clinical DEXA scans within ±2.3% for healthy adults.