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manual calorie and macro calculation

Evidence-based framework for calculating energy expenditure and partitioning macronutrients using clinical standards.

Static — this skill doesn't adapt to your week.

Tags: nutrition, macros, metabolism, education

Tools used

Procedure

Procedure

  1. Establish Resting Energy Expenditure (REE)

    • Retrieve the user's age, weight (kg), and height (cm).
    • Apply the Mifflin-St Jeor Equation to estimate Basal Metabolic Rate (BMR).
    • Calculation:
      • Male: (10 × weight) + (6.25 × height) - (5 × age) + 5
      • Female: (10 × weight) + (6.25 × height) - (5 × age) - 161
    • Use the compute_bmr tool to standardize this value.

  2. Determine Total Daily Energy Expenditure (TDEE)

    • Assess the user's current physical activity level (PAL).
    • Apply the appropriate multiplier to the BMR:
      • Sedentary: 1.2
      • Lightly Active (1–3 days/week): 1.375
      • Moderately Active (3–5 days/week): 1.55
      • Very Active (6–7 days/week): 1.725
      • Extra Active (Physical job/2x training): 1.9
    • Use the compute_tdee tool to finalize the caloric baseline.

  3. Partition Macronutrients (AMDR Framework)

    • Determine the distribution based on Acceptable Macronutrient Distribution Ranges (AMDR):
      • Carbohydrates: 45% – 65% of total calories.
      • Proteins: 10% – 35% of total calories.
      • Fats: 20% – 35% of total calories.
    • Align the distribution with the user's specific goals (e.g., higher protein within the range for muscle maintenance).

  4. Execute Gram Conversions

    • Convert caloric allocations to grams using the Atwater System energy densities:
      • Protein: 4 kcal/g
      • Carbohydrates: 4 kcal/g
      • Fats: 9 kcal/g
    • Use the compute_macros tool or perform manual steps: (Total Calories × Target %) / kcal per gram.

  5. Implement Educational Onboarding

    • Guide the user through the four stages of implementation:
      • Stage 1 (Literacy): Instruct on reading FDA Nutrition Facts Labels to identify macro grams versus total calories.
      • Stage 2 (Accuracy): Recommend moving from volume measurements (cups) to digital food scales (grams) for raw ingredients.
      • Stage 3 (Synthesis): Advise using the USDA FoodData Central database for manual entry to ensure "ground truth" accuracy over automated photo logs.
      • Stage 4 (Intuition): Transition to visual portion estimation once manual precision is mastered.

  6. Finalize Targets

    • Apply the calculated values to the user's profile using set_user_macro_targets.
    • Remind the user that these calculations are physiological estimates and should be adjusted based on recorded biochemical or anthropometric progress over time.