Definition
Metabolism is the sum of chemical processes that maintain living tissue — how input (food, air, sleep, stress) becomes usable energy and how waste clears. Interoceptive training treats metabolic feel (digestion, congestion, fasting clarity) as data, not moral failure.
Origin
Physiology treats metabolism as continuous energy intake, expenditure, and storage in a dynamic system — not a fixed “speed setting” on a dial.
Mechanism
Fuel intake, hormonal signalling, and autonomic tone interact: digestion, nasal patency, fasting windows, and inflammatory readouts (gut, sinuses, skin) reflect overlapping regulation. Hall et al. frame energy balance as a biological system whose components change over time with environment — popular “fast vs slow metabolism” slogans oversimplify measurable intake–expenditure dynamics. Quantified Self panels and daily signals (resting heart rate, sleep, subjective clarity) sit on the same map when measurement quality is honest about error bands.
Applications
Log one metabolic signal you track (digestion, nasal cycle, fasting window, supplement response) and what you are testing — curiosity before complaint. Long-form spine: Autonomous Intelligence of the Body · Why Zebras Don’t Get Ulcers.
Related doctrine
Sources
Cite
- Hall, K. D., Heymsfield, S. B., Kemnitz, J. W., Klein, S., Schoeller, D. A., & Speakman, J. R. (2012). Energy balance and its components: Implications for…. American Journal of Clinical Nutrition, 95(4), 989–994
- Guyton, A. C., & Hall, J. E. (2020). Guyton and Hall textbook of medical physiology (14th ed.). Elsevier
- Stress–metabolism interface: Why Zebras Don’t Get Ulcers