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Resting Energy Expenditure (REE) Recommended Formulas
Resting Energy Expenditure (REE), also referred to as Resting Metabolic Rate (RMR) is defined as the amount of calories expended at rest. While there are many methods to calculate REE, we recommend using the Mifflin St. Jeor Equation. See below for references, guidance on how to properly apply the Mifflin St. Jeor Equation, and the truth behind common misuses of this equation.
The Mifflin St. Jeor Equation
The Recommended, Evidence-Based Method for Estimating Resting Energy Expenditure (REE)
The   Mifflin   St.   Jeor   Equation   (MSJE)   was   created   by   Dr.   Sachiko   St.   Jeor,   President   of   Genquest   Nutrition   Solutions,   and   her   medical   student,   Dr. Mark   Mifflin   (see   Reference   1,2   in   link   below).   In   2005,   the   MSJEwas   designated   by   the   Academy   of   Nutrition   and   Dietetics   as   the   evidence-based standard   predictive   equation   for   REE.   Explore   the   links   below   to   see   sample   calculations   of   REE   using   the   MSJE,   a   list   of   references   for   the equation, and a comparison of the Mifflin St. Jeor Equation (1990) versus the Harris-Benedict Equation (1919).
Discerning Fact from Fiction: Application of the Mifflin St. Jeor Equation
Interactive Mifflin St. Jeor Equation Calculation Wheel
Click HERE to see a  preview demonstration of our interactive Mifflin St. Jeor Equation Calculation Wheel, available for purchase in our Marketplace.
1. Resting Energy Expenditure/Resting Metabolic Rate (REE/RMR) are NOT synonymous with Basal Energy Expenditure/Basal Metabolic Rate (BEE/BMR). While the REE and RMR can be used interchangeably, they are not the same as BEE and BMR. The resting state is approximately 10% above the basal state (REE = BEE + 10%). This 10% can be accounted for by the Thermic Effect of Food (TEF). Formula Calculations for Total Energy Expenditure (TEE) using the MSJE take into account TEF. TEE may be calculated as follows: TEE= BEE + PAF + TEF   or TEE= REE+ PAF*,        where PAF represents a Physical Activity Factor
2. Activity factors should not be assigned arbitrarily. Search “Mifflin St. Jeor Equation Calculator” and you will find a variety of third-party calculators that provide a wide range of activity factors! However, we recommend using the standard activity factors 1.2 (sedentary activity level), 1.4 (low to moderate activity level), and 1.6 (high activity level). Some current formulas recommending higher PAF levels warrant further testing. However, we are currently on new methods to standardize the PAF.
3. Keep watching for new evidence and practice-based methods for activity factors. Genquest Nutrition Solutions is currently collaborating with leaders in the field to find the best ways to calculate measures of energy balance beyond the Mifflin St. Jeor Equation. Come back to our website soon as we update you on new innovations, including  new strategies for determining physical activity level, assigning activity factors, and more!
The Formula
Click on the link above for an in-depth explanation and walk-through of how to properly use the Mifflin St. Jeor Equation formula.
MALE 10 x wt (kg) + 6.25 x ht (cm) - 5 x age (y) + 5  
FEMALE 10 x wt (kg) + 6.25 x ht (cm) - 5 x age (y) - 161
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