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Energy Deficit CalculationAka: Resting Energy Expenditure, Daily caloric need, Adjusted caloric intake

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  1. Step 1: Estimate Resting Energy Expenditure (REE)
    1. Based on Mifflin-St Jeor Equation
    2. Males Resting Energy Expenditure
      1. Start: 10 x (Weight in kilograms) + 5
      2. Add: 6.25 x (Height in centimeters)
      3. Subtract: 5 x (Age in years)
    3. Females Resting Energy Expenditure
      1. Start: 10 x (Weight in kilograms) - 161
      2. Add: 6.25 x (Height in centimeters)
      3. Subtract: 5 x (Age in years)
  2. Step 2: Estimate Daily caloric need
    1. Consider Activity factor (AF) of 1.0
      1. AF >1.0 grossly overestimates caloric needs
      2. Using activity factor of 1.0 may be weight neutral
        1. Mucha (2007) HP Primary Care Medicine, Lecture
        2. Bezera (2001) J Amer Dietetic Assoc :
    2. Determine Activity Factor (AF)
      1. Activity Factor = 1.5
        1. Women doing light activity
      2. Activity Factor = 1.6
        1. Men doing light activity
        2. Women doing moderate activity
      3. Activity Factor = 1.7
        1. Men doing moderate activity
    3. Determine Daily caloric need
      1. Resting Energy Expenditure x Activity Factor
      2. See also Daily Energy Allowances
  3. Step 3: Calculate Adjusted caloric intake
    1. Determine daily caloric deficit (Usually 500 kcals/day)
      1. Deficit of 500 Kcals/day = 3500/week (1 pound/week)
    2. Determine Adjusted caloric intake
      1. Daily caloric need - Daily caloric Deficit (500)
      2. Do not lower intake below 1200 Kcals/day
      3. Consider using REE x0.8 for weight loss program
        1. Mucha (2007) HP Primary Care Medicine, Lecture
        2. Bezera (2001) J Amer Dietetic Assoc :
  4. References
    1. Frank (1998) J Am Diet Assoc 98:S44
    2. Lyznicki (2001) Am Fam Physician 63(11):2185
    3. Rippe (1998) J Am Diet Assoc 98:S9
    4. Speer (1997) Phys Sportsmed 25:94
    5. (1998) AOA Treatment Adult Obesity, 2nd edition

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