There are many ways to measure TEE, and weight loss practitioners need to use the tools that are available to provide the best estimate. Doubly labeled water is considered the gold standard; though, for reasons previously described this assessment is not always practical. Other assessments of TEE include the use of Physical Activity Questionnaires and corresponding METs to add up expenditure throughout the day, predictive equations multiplied by an activity coefficient, and estimated energy needs using kcal/kg. For improved accuracy with any of these methods, details regarding the frequency, intensity, and duration of activity should be collected during the nutrition assessment. No method is without limitations, and it is up to the practitioner to determine which method is most appropriate based on available resources.
Joule the SI unit of energy or work; equals the energy that is transferred when applying a force of one newton through a distance of one meter.
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Resting energy expenditure (REE) equivalent to resting metabolic rate (RMR); the amount of energy needed by the body at rest. Testing conditions are less stringent than BEE, which can result in a slightly higher value than BEE.
Basal energy expenditure (BEE) equivalent to basal metabolic rate (BMR); the amount of energy needed by the body at complete rest. To be accurate, this must be measured in a postabsorptive state (the individual must not be actively digesting food and should be fasted more than 8 hours) and should be assessed immediately upon waking and before rising in the morning.
Adaptive thermogenesis the decrease in energy expenditure beyond what could be predicted from body weight or its components as a result of a decrease in energy intake.
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