1 What Is FBM · 1.1 Core Definition
1.1 Core Definition
Feline Fat-Based Metabolism (Fat-Based Metabolism)
Feline Fat-Based Metabolism (Feline FBM) is a food-structure judgment framework built on the cat’s carnivorous metabolic structure.
It does not judge an ingredient list or an isolated nutrient percentage.
It judges which long-term operating state the cat’s metabolic system enters after food structure enters the body.
In Feline FBM, this page belongs to the definition layer: it fixes what the system is, not a product claim or a clinical label.
primary energy substrate
exogenous carbohydrate load
insulin regulation state
fatty acid oxidation pathway
protein energy pressure
solute load per unit energy
digestion and fat transport
water recovery
skin-sebum system
long-term observable outputs
Feline FBM is not a “high-fat diet” view.
It is a system that takes food structure as the entry point and long-term metabolic operating state as the judgment object.
Feline FBM is organized around seven primary control variables.
Judges which substrate class carries energy over the long term.
If exogenous carbohydrate remains the main energy entry, the system is pushed toward glucose scheduling.
If fatty acids become the long-term primary energy substrate, the system enters a different operating state.
Exogenous carbohydrate is not a neutral variable in Feline FBM.
It changes glucose scheduling, insulin regulation state, and energy allocation.
Insulin regulation state changes the probability that energy enters use pathways versus storage pathways.
Feline FBM does not judge calories alone; it judges how energy is scheduled after entry.
Fatty acids are the long-term primary energy substrate in Feline FBM.
This requires fat freshness boundary, fat processing rate, digestive accommodation, and food structure to hold together.
Protein is required structural material and an amino acid source.
Protein should not be pushed into the primary energy substrate role over the long term.
Higher protein energy pressure raises nitrogen handling pressure and solute load per unit energy.
How much nitrogen, minerals, and other solutes the kidney must process per unit of energy is a key variable for renal pressure.
Urinary outputs cannot be reduced to drinking less water.
Loose stool, constipation, hairball vomiting, greasy coat, acne-like chin presentation, urinary concentration, coat condition, and body-fat state are outputs.
Outputs are not root causes.
They function only as backtrace entry points into system variables.
upstream food structure
control variables (primary energy substrate, exogenous carbohydrate load, insulin regulation state, and others)
system operating state (digestion and fat transport, water recovery, renal handling, skin-coat system)
observable outputs
The forward chain shows how food structure pushes the system into a long-term operating state and how outputs appear at different exits.
observable output
direct output variable
intermediate mechanism variable
upstream food structure
Feline FBM does not move from symptom to solution. It moves from output upward through mechanism, then back to food structure.
urinary concentration
renal handling pressure (direct output variable)
solute load per unit energy, protein energy pressure (intermediate mechanism variables)
upstream food structure
greasy coat / acne-like chin presentation
sebaceous synthesis and release state, sebum processing rate (direct output variables)
energy scheduling, fat freshness boundary, local skin environment (intermediate mechanism variables)
upstream food structure
Feline FBM can be used to explain the following long-term outputs:
Backtrace to fat processing rate, bile-acid-related colonic regulation, colonic propulsion, and stool water content.
Backtrace to proximal small-intestinal water recovery, SGLT1-mediated water-sodium absorption, colonic propulsion, and stool water content.
Backtrace to gastric emptying speed, gastric hair residence time, hair entanglement probability, and regurgitation probability.
Backtrace to sebaceous synthesis and release, ingredient state, fat freshness boundary, and local skin environment.
Backtrace to solute load per unit energy, protein energy pressure, mineral structure, and renal handling pressure.
Backtrace to exogenous carbohydrate load, insulin regulation state, primary energy substrate, and energy allocation.
These outputs are not isolated problems. They are output signals from the same food structure at different system exits.
Feline FBM can be used to judge how food structure affects the cat’s long-term metabolic operation
Feline FBM can explain relationships among primary energy substrate, insulin regulation, solute load, water recovery, the sebum system, and long-term outputs
Feline FBM is not a clinical diagnosis system
Feline FBM is not a disease treatment protocol
Feline FBM is not a formula disclosure page
Feline FBM is not “the higher the fat, the better”
Feline FBM is not “low carbohydrate alone proves metabolic fit”
Feline FBM is not an effect-guarantee system
This page fixes one rule only: the core judgment object of Feline FBM is not a nutrient checklist, but the long-term metabolic operating state formed after food structure enters the cat.