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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 (MJSE)
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).
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 TRANSGENDER 10 x wt (kg) + 6.25 x ht (cm) - 5 x age (y) - 78* * Katz/Aronson, Diet ID: -78 is the mean (average) of the male and female factors using the MSJE. The transgender population needs further study. We recommend additional measures of body composition (lean body mass and body fat percentage) waist circumference and grip strength for comparison.
2. 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.  IDC The IDC is an “integrated” measure of REE at the time of measurement and the resulting value represents factors occurring and affecting metabolismand results at that time. If the client is rested and baseline condition are followed, results are reportedly accurate to within 1%. Comparitively, the MJSE has been predicted to be ±10% of the actual value. We propose using this ratio as a general check. We recommend further questioning andfollow-up investigation of factors that may contribute to a higher or lower value when the ratio is beyond the ±10% range. Factors such as disease, medications, changes in weight and metabolism may have a direct affect on REE overtime and are not measured by theMSJE. Comparatively, many factors such as compromised breathing, unrest, and hyperactivity may affect the IDC reading. So values outside the ±10% range should be questioned and followed closely for overall status and need for reassessment.
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