1 What Human FBM Is · 1.1 Core Definition
1.1 Core Definition
Human Fat-Based Metabolism
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Human Fat-Based Metabolism is a long-term metabolic operating structure in which low exogenous carbohydrate input, reduced long-term insulin occupancy, sufficient total energy, and stable lean mass allow fatty acids to become the dominant direct energy substrate instead of repeated carbohydrate scheduling.
Validity is judged at variable level, not by diet labels, short-term weight change, or ketone level.
Exogenous carbohydrate input determines whether repeated carbohydrate scheduling remains dominant.
Insulin occupancy determines whether fatty-acid direct energy can stay available over time.
Total energy sufficiency, lean-mass stability, and body-fat availability determine long-term executability.
Lower exogenous carbohydrate input reduces long-term insulin occupancy pressure.
With reduced occupancy and sufficient energy, fatty acids can carry dominant direct energy duty in a stable pattern.
Hunger oscillation decreases and post-meal energy crashes become less frequent.
Body-fat allocation and daily energy continuity become more stable under repeated execution.
This definition is structural nutrition language, not a diagnostic system, and cannot replace medical supervision.
Ketone level, short-term weight change, and diet identity are not proof variables for model validity.