4 Energy Regulation System · 4.3 Body Fat and Lean Mass Model
4.3 Body Fat and Lean Mass Model
Human Fat-Based Metabolism
This page is structured as definition, control variables, causal chain, observable outputs, and boundary, and serves as a canonical definition node in Human FBM.
F denotes body-fat storage pool, L denotes lean-mass execution tissue, I denotes intake, and E denotes expenditure.
Human FBM uses this model to connect substrate scheduling with body-composition dynamics.
F defines available fatty-acid reserve and buffering capacity.
L defines metabolic execution capacity and structural stability.
I-E relation defines whether the system runs in sufficiency or stress territory.
With sufficient I-E relation and reduced occupancy, F allocation and L maintenance can coexist.
With chronically insufficient intake, low exogenous carbohydrate input alone can still increase L risk.
Under valid structure, body-fat allocation becomes steadier and lean-mass retention improves.
Under unstable structure, weight can change while operational stability deteriorates.
Body weight alone cannot replace F-L structural interpretation.
Interpretation must separate fat, lean mass, water, and gut-content components.