Metabolism

Metabolism is the rate at which the hardware converts fuel into usable energy — the system’s idle speed.

Every organism runs at a specific metabolic rate determined by the Genetics entry’s specifications, modified by the current conditions: muscle mass, activity level, hormonal state, age, and ambient temperature. The hardware is always burning fuel, even at rest — maintaining body temperature, running organs, processing signals, sustaining the background operations. The metabolic rate is how much fuel this operation costs per unit of time.

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The system’s metabolic rate is not fully within the operator’s control, but the variables that modify it are partially accessible. Movement and muscle mass increase the rate. Chronic stress initially increases it (the alert state burns more fuel) and eventually decreases it (the system conserves under sustained load). Sleep disruption alters the rate. Aging decreases it — the hardware’s idle speed drops progressively across the operating life.

The practical consequence: the fuel input that maintained stable weight at twenty-five will produce weight gain at forty-five if the metabolic rate has dropped and the input hasn’t adjusted. The system changed its specifications. The operator who didn’t notice is overfeeding a system with a lower burn rate.

From the chair: the metabolism is a specification. Know the current specification — through the body’s feedback signals, not through the assumption that it matches a younger version of the hardware — and calibrate the fuel input accordingly. The system reports when the ratio is off. Read the report.