Total energy expenditure (TEE) is the total energy the body uses for maintaining essential body functions, digesting and absorbing food and being physically active.
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The stable isotope technique of doubly labelled water is the only method that enables the assessment of TEE under free-living conditions without disruption to everyday activities, making it ideal for use in many field settings.
The assessment of TEE can be used to determine energy requirements, develop and evaluate energy balance interventions, and validate simple techniques to assess energy intake and expenditure, and physical activity.