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Metabolism is the term for the biochemical process of breaking down the molecular bonds in the fats and sugars for the energy needed to assemble the molecule ATP.
Kilian Jornet • Training for the Uphill Athlete: A Manual for Mountain Runners and Ski Mountaineers

AMPK enhances your metabolism is by stimulating the creation of more mitochondria, a process called mitochondrial biogenesis. Having more mitochondria is generally considered a good thing, and we know this because chronic disuse of muscle, sedentary behavior, and aging each independently result in a decline in mitochondrial content and function.
Paul Grewal • Genius Foods: Become Smarter, Happier, and More Productive While Protecting Your Brain for Life (Genius Living Book 1)
Metabolism is what keeps us alive – it is what being alive is – the sum of the continuous transformations of small molecules on a timescale of nanoseconds, nanosecond after nanosecond.
Nick Lane • Transformer: The Deep Chemistry of Life and Death

Metabolic Health Affects Everything When your metabolism isn't working well because of excess weight, it affects how your body processes sugar, burns calories, and maintains energy throughout the day.
Your metabolism is a system that controls every single function in your body; it is the basis for life itself.
William W Li • Eat to Beat Your Diet: Burn Fat, Heal Your Metabolism, and Live Longer
readthegeneralist.com • Levels: A Cultural Anomaly | the Generalist
In basic biochemistry, it’s well-understood that the breakdown of ATP to ADP + phosphate is required for the cell to use glucose and oxygen in order to maintain homeostatic functioning of the body’s core metabolic processes.35 This breakdown to ADP and phosphate cannot happen without the presence of adequate sodium in the fluid around the cell.36