Energy balance
Static energy balance models (e.g., the 3500 kcal rule) significantly overestimate weight loss because they ignore adaptive thermogenesis, which causes resting energy expenditure to drop beyond what is explained by the loss of metabolically active tissue.
If you are dieting and hitting a plateau despite strict adherence to a calorie deficit, do not simply slash calories further. Your body has likely triggered adaptive thermogenesis, lowering your metabolic rate to protect fat stores. Recognize this as a biological defense mechanism, not a personal failure. Sustainable weight management may require longer adaptation periods or strategies that preserve fat-free mass, rather than aggressive restriction.
Static modelling disregards obligatory changes in energy expenditure associated with the loss of metabolically active tissue, i.e. skeletal muscle. Additionally, it disregards the presence of adaptive thermogenesis, the underfeeding-associated fall in resting energy expenditure beyond that caused by loss of fat-free mass.
Why this rating
The paper is a comprehensive review citing multiple longitudinal studies (e.g., Minnesota Starvation Experiment, CALERIE) and meta-analyses.
Source
Dynamic changes in energy expenditure in response to underfeeding: a review
Aoife M. Egan et al. · Proceedings of The Nutrition Society · 2021
DOI 10.1017/s0029665121003669
More from this paper
- Adaptive thermogenesis (AT) is primarily mediated by hormonal signals (leptin and insulin) that downregulate substrate cycling in skeletal muscle, reducing energy expenditure to preserve fat stores.Good
- Metabolic adaptation (adaptive thermogenesis) is dynamic and largely reversible; it persists during negative energy balance but diminishes or disappears during weight stability or positive energy balance (refeeding).Good
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