Energy Deficit Calculation

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 101
   2. 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 1000 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 101
      4. Consider calorie intake goal based on body weight range
         1. Body weight <200 pounds: 1000 Kcals/day (500 kcal deficit per day)
         2. Body weight 200-249 pounds: 1200 Kcals/day (750 kcal deficit per day)
         3. Body weight 250-299 pounds: 1500 Kcals/day (1000 kcal deficit per day)
         4. Body weight 300-349 pounds: 1800 Kcals/day (1250 kcal deficit per day)
         5. Body weight >350 pounds: 2000 Kcals/day (1500 kcal deficit per day)
         6. Klein (2002) 123(3): 882-932
4. References
   1. Frank (1998) J Am Diet Assoc 98:S44-48
   2. Lyznicki (2001) Am Fam Physician 63(11):2185-96
   3. Rippe (1998) J Am Diet Assoc 98:S9-15
   4. Speer (1997) Phys Sportsmed 25:94-107
   5. (1998) AOA Treatment Adult Obesity, 2nd edition