Weight gain is solely a function of calorie intake minus calorie consumption
While the laws of thermodynamics dictate that energy balance governs weight change, physiological and metabolic adaptations complicate the simple subtraction of calories, making actual weight trajectories difficult to predict by arithmetic alone.
The claim posits that weight gain is *solely* a function of calorie intake minus calorie consumption. While energy balance is fundamentally governed by these thermodynamic components, modern physiological and metabolic research shows that the body dynamically adapts its energy expenditure, hormone regulation, and feeding behavior in response to changes in diet and weight. Papers [9] and [10] demonstrate that simple arithmetic models fail to accurately predict exact weight gain due to these complex adaptive shifts, leading to a contested verdict rather than pure reductionist support.
Weight gain is largely governed by energy balance, though physiological and metabolic adaptations complicate simple arithmetic predictions.
Frank M. Sacks, George A. Bray, Vincent J. Carey, Steven R. Smith, Donna H. Ryan, Stephen D. Anton, Katherine McManus, Catherine M. Champagne, Louise Bishop, Nancy Laranjo, Meryl S. LeBoff, Jennifer Rood, Lilian de Jonge, Frank L. Greenway, Catherine M. Loria, Eva Obarzanek, Donald A. Williamson. Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates. 2009. https://doi.org/10.1056/nejmoa0804748
Sacks et al. (2009) demonstrated that reduced-calorie diets result in weight loss regardless of macronutrient composition, supporting the fundamental role of energy balance.
Yasmin Begum, Shanakey Cupidon, Tasnia Aftab, Michael Anazodo. Comparison of dynamic model predicted and actual weight gain during overfeeding: An energy balance analysis. 2013. https://doi.org/10.1096/fasebj.27.1_supplement.1069.1
However, [9] (2013) found that standard dynamic prediction models systematically misestimate actual weight gain during overfeeding due to complex shifts in energy expenditure.
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Abdul G. Dulloo, Yves Schutz. Energy balance and body weight regulation. 2023. https://doi.org/10.1093/hesc/9780198866657.003.0008
A chapter on energy balance by [8] (2023) highlights that body weight regulation revolves fundamentally around the interlinking of energy intake and expenditure.
Yasmin Begum, Shanakey Cupidon, Tasnia Aftab, Michael Anazodo. Comparison of dynamic model predicted and actual weight gain during overfeeding: An energy balance analysis. 2013. https://doi.org/10.1096/fasebj.27.1_supplement.1069.1
Bouchard and Levine overfeeding studies analyzed by [9] (2013) show strong correlations between intake-based model predictions and actual weight changes.
Payam A. Fathi, Michelle B. Bales, Julio E. Ayala. Time dependent changes in feeding behavior and energy balance associated with weight gain in mice fed obesogenic diets. 2024. https://doi.org/10.1101/2024.01.10.575043
Research by [10] (2024) shows that weight gain involves complex neurohormonal and behavioral adaptations, such as metabolic and satiety dysregulation, rather than being a mere passive arithmetic calculation of calories.
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