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BMI (Body Mass Index) estimates body fat from weight and height. It screens for weight categories but cannot diagnose individual health — muscle mass, bone density, and body composition are not accounted for.

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1. 1Metric: BMI = weight(kg) ÷ height(m)²
2. 2Imperial: BMI = 703 × weight(lb) ÷ height(in)²
3. 3Compare result to WHO categories
4. 4Consult a healthcare professional for full assessment

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