Basal metabolic rate decreases in response to calorie restriction diets
Basal metabolic rate decreases during calorie restriction diets as part of an adaptive thermogenesis response to energy deficits.
The retrieved literature consistently supports the claim that basal metabolic rate or resting energy expenditure decreases during calorie restriction diets, a phenomenon widely referred to as adaptive thermogenesis or metabolic adaptation. Multiple papers (e.g., 2, 4, 7, 10, 11) confirm this physiological response. There are no papers refuting the claim.
Dulloo AG. Adaptive thermogenesis driving catch-up fat during weight regain: a role for skeletal muscle hypothyroidism and a risk for sarcopenic obesity.. 2025. https://doi.org/10.1007/s11154-025-09970-9
Paper 2 discusses how adaptive thermogenesis occurs in response to large weight deficits from calorie restriction.
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Wang D, Djalalvandi A, Saed CT, Morrison KM, Steinberg GR. Can muscle avert GLP1R weight plateau and regain?. 2025. https://doi.org/10.1016/j.xcrm.2025.102308
Paper 4 notes that weight loss therapies and calorie restriction lead to decreased energy expenditure via adaptive thermogenesis.
de Moraes Campos TA, Brasil RLF, Bezerra FF. Effect of Time-Restricted Eating on Metabolic Adaptation in Adults With Severe Obesity During Early Phase of Weight Loss.. 2026. https://doi.org/10.1111/jhn.70293
Paper 7 evaluates resting metabolic rate and early adaptive thermogenesis during energy restriction.
Lasik L, Ukleja-Sokołowska N. Restoring Satiety After GLP-1/GIP Pharmacotherapy: Metabolic Stability, Diet Quality, and the Gut Microbiota.. 2026. https://doi.org/10.3390/ijms27114658
Paper 10 notes that weight loss is driven in part by persistent metabolic adaptations, including a reduction in resting energy expenditure.
Johnson KE, Curran B, Roberson S, Corso H, Hoelscher E, Campbell BI, Rabon K, Lovering A, Albert M. The Effects of Continuous vs. Intermittent Caloric Restriction on Fat Loss: A Randomized Controlled Trial.. 2026. https://doi.org/10.3390/nu18111823
Paper 11 cites physiological adaptations to energy restriction, including reductions in resting metabolic rate.
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