Energy balance
Energy expenditure can be increased through specific physiological mechanisms independent of physical activity, including UCP1-dependent thermogenesis in brown/beige fat, futile cycling of substrates (creatine, glucose, lipids), and ion pumping (Na+/K+-ATPase, SERCA).
Your body burns calories through several active processes beyond just moving around. These include generating heat in fat tissue (thermogenesis), running 'futile' metabolic cycles that burn energy as heat, and maintaining electrical gradients in cells. While you can't easily control these directly, understanding them helps explain why some medications work better than others. Future treatments may target these specific pathways to help you burn more calories passively.
This section will highlight crucial mechanisms throughout the body that increase EE independently from physical activity... Thermogenesis is the process in which nutrient breakdown... generates a proton gradient uncoupled from ATP synthesis... Futile cycling occurs when two opposing metabolic reactions are simultaneously active... Na+/K+–ATPase... accounts for roughly 20% of whole-body BMR
Why this rating
This is a review paper detailing established physiological mechanisms; evidence is foundational biology.
Source
Improving incretin-mediated body weight loss via energy expenditure
Andrew J. Elmendorf et al. · Trends in Endocrinology and Metabolism · 2026
DOI 10.1016/j.tem.2025.12.004
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