Abstract
Hall and colleagues clarify energy balance components — intake, expenditure, and storage interact with adaptive feedback, so simple calories-in-calories-out masks how the system responds.
Hall, K. D., Heymsfield, S. B., Kemnitz, J. W., Klein, S., Schoeller, D. A., & Speakman, J. R. (2012). American Journal of Clinical Nutrition, 95(4), 989–994. DOI
Key findings
- Component model — Weight regulation involves intake, expenditure, and storage — each with distinct dynamics.
- Adaptive expenditure — Expenditure adapts to intake and mass — the body is not a passive ledger.
- Storage dynamics — Fat and lean compartments feed back on appetite and metabolism.
- Individual paths — Same deficit produces different trajectories — averages hide person-specific loops.
Limits
Physiology review — mechanism map, not a personal diet prescription.
Application
When the scale stalls despite discipline — the system adapts; balance is feedback, not a fixed trick. See Metabolism.