The anatomy of resting energy expenditure: body composition mechanisms.
Level 5 - mechanism / opinion, no new human data
Narrative review and mechanistic framework synthesis without systematic review methodology.
PubMed 30254244 · doi:10.1038/s41430-018-0319-3
What was done
This narrative review synthesized physiological and anatomical models relating whole-body resting energy expenditure (REE) to individual organ and tissue masses and their mass-specific metabolic rates. The authors examined how adult stature (height) and adiposity govern organ scaling and metabolic load, integrating these mechanisms into classical statistical REE prediction models.
What was found
The abstract reports no numerical values, effect sizes, or quantitative model performance metrics. It describes the conceptual framework wherein total REE equals the sum of organ- and tissue-specific metabolic rates (calculated from imaging-derived mass and assumed mass-specific metabolic rates), showing that organ masses follow distinct scaling patterns with height and adaptively accommodate the mechanical and metabolic loading of increased adiposity.
Why it matters
It provides an anatomical, organ-level explanation for why standard anthropometric variables like height and weight predict resting metabolic rate, shifting REE estimation from purely empirical statistical models to biological mechanisms.
Limits
The abstract contains no new empirical data, statistical testing, or systematic review methodology. Individual organ metabolic rates are based on assumed values rather than direct real-time in vivo measurements, and variation across diverse clinical or demographic subgroups is not quantified in the abstract.
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