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Deep Dive: Demystifying Body Fat Percentage & Lean Mass
Body fat percentage measures the total mass of fat divided by your total body weight. Unlike BMI, it isolates fat tissue from lean body mass (muscles, bones, organs, and water), providing a much clearer view of physical composition.
🧮 How to Calculate (Step-by-Step Formula)
- Measure your height and the circumference of your neck and waist (and hips for women) in inches or centimeters.
- For Men, calculate density using the U.S. Navy formula: Body Fat % = 86.010 × log10(waist - neck) - 70.041 × log10(height) + 36.76.
- For Women, use: Body Fat % = 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387.
- Subtract body fat weight from total weight to calculate your lean body mass.
Key Concepts & Terminology Decoded
- Essential Fat: The minimum fat required for neurological, physiological, and hormonal health (typically 3-5% in men and 10-13% in women).
- Lean Body Mass: Everything in your body that is not fat tissue (muscle tissue, bones, organs, connective tissue, and water).
- U.S. Navy Method: A highly popular and reliable mathematical body fat estimation model utilizing neck, waist, hip (for women), and height measurements.
💡Focus on preserving lean muscle mass during fat loss by maintaining a high-protein intake and incorporating resistance training.