Procedure

1. Assess Measurement Context

   • Identify the method the user used to obtain their body fat percentage (e.g., BIA/Smart Scale, Skinfolds, DEXA).
   • Inform the user of the inherent error margins for that method (e.g., $\approx 5%$ for BIA, $3\text{--}4%$ for DEXA).
   • Use compute_waist_to_height to establish a health-risk baseline, targeting a range of $0.4\text{--}0.49$.

2. Establish Realistic Goals

   • Determine the user's target range based on biological sex and age:
     • Athletic/Fit: Men $6\text{--}13%$; Women $14\text{--}20%$.
     • Acceptable/Healthy: Men $12\text{--}24%$; Women $20\text{--}31%$.
   • For users over 60, adjust the acceptable range upward (e.g., up to $24%$ for men and $42%$ for women) to account for natural sarcopenia and hormonal shifts.
   • Warn against goals below essential fat levels (Men $<5%$, Women $<13%$).

3. Develop a Recomposition Training Plan

   • Use create_workout to design a resistance training program with a minimum frequency of 2 days per week to signal muscle preservation.
   • Prioritize compound movements and progressive overload to drive hypertrophy.
   • Advise the user that successful recomposition is characterized by stable weight paired with decreasing waist circumference and increasing strength.

4. Calibrate Nutritional Support

   • Advise on high protein intake to prevent muscle wasting.
   • Set caloric targets based on training status:
     • Fat Loss Focus: Moderate calorie deficit.
     • Muscle Gain/Maintenance: Maintenance calories for beginners; slight surplus for advanced trainees.

5. Implement Long-Term Monitoring

   • Instruct the user to ignore weekly fluctuations of $\approx 1%$ which may be "noise" from hydration.
   • Establish a "Multi-Metric Anchor":
     • Weekly: Track trends via BIA scales or waist circumference.
     • Every 3–6 months: Use a high-accuracy anchor like a DEXA scan for a regional breakdown of fat and muscle.
   • Use update_preferences to log these tracking intervals.