Life sciences · Journal article
npj Aging · September 19, 2026
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Abstract Age-associated weight gain is commonly attributed to behavioral or metabolic changes. We propose the completion gap framework, in which meal-completion requirements and physiological energy demand are only partially coupled. Persistent mismatch between these variables produces gradual weight gain until a higher equilibrium body weight is reached. This systems-level perspective integrates existing regulatory models while generating experimentally testable predictions for aging, obesity, and nutrition.