ABSTRACT
This chapter describes the assessment of energy intake based on the assessment of resting energy expenditure (REE) and Activity-induced energy expenditure (AEE), where REE is estimated with a prediction equation and AEE is derived with a doubly-labeled water validated accelerometer for movement registration. Energy intake is a function of energy requirement as determined by REE and AEE. One of the applications of REE and activity energy expenditure as biomarker of intake is the identification of under-reporters of energy intake (EI) with the Goldberg cut off. Energy requirement is a function of energy expenditure for body maintenance or REE and of physical activity or AEE. A typical protocol for a REE measurement with a ventilated-hood system takes 30 minutes. The easiest way to estimate habitual energy intake for weight maintenance from REE and AEE is the application of a device producing values for total energy expenditure based on subject sex, weight, height, age, and measured body acceleration.
