Evolving concepts on adjusting human resting energy expenditure measurements for body size

Establishing if an adult's resting energy expenditure (REE) is high or low for their body size is a pervasive question in nutrition research. Early workers applied body mass and height as size measures and formulated the Surface Law and Kleiber's Law, although each has limitations when adjusting REE. Body composition methods introduced during the mid-20th century provided a new opportunity to identify metabolically homogeneous active compartments. These compartments all show improved correlations with REE estimates over body massheight approaches, but collectively share a common limitation: REE-body composition ratios are not constant but vary across men and women and with race, age and body size. The now-accepted alternative to ratio-based norms is to adjust for predictors by applying regression models to calculate residuals that establish if an REE is relatively high or low. The distinguishing feature of statistical REE-body composition models is a non-zero intercept of unknown origin. The recent introduction of imaging methods has allowed development of physiological tissueorgan-based REE prediction models. Herein, we apply these imaging methods to provide a mechanistic explanation, supported by experimental data, for the non-zero intercept phenomenon and, in that context, propose future research directions for establishing between-subject differences in relative energy metabolism.