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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—the continuous chemical and physical processes in the body involving the creation and breakdown of molecules; for instance, glucose can be metabolized to release its energy as ATP.
Dr. Ray Sahelian • Mind Boosters

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
Metabolism is the process by which we take in nutrients and break them down for use in the body. In someone who is metabolically healthy, those nutrients are processed and sent to their proper destinations. But when someone is metabolically unhealthy, many of the calories they consume end up where they are not needed, at best—or outright harmful,
... See morePeter Attia MD • Outlive: The Science and Art of Longevity




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.
Think of metabolism as a miniature ATP recycling plant in the muscle cells. After ATP is broken apart to extract the energy needed for muscle contraction, then the metabolic recycling plant using the energy from food reassembles the ATP molecules so the whole process can keep going.