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Feline Fat-Based Metabolism
Fat-Based Metabolism for Obligate Carnivores
Feline Fat-Based Metabolism (Feline FBM) is a species-specific metabolic framework for reading feline food as structure, not as market category, ingredient list, or isolated nutrient percentage. It evaluates how food structure changes the cat’s long-term energy regulation, digestive handling, water recovery, renal solute load, skin-sebum output, hairball pathway, and observable outputs.
This English edition follows the Chinese canonical structure. Each page defines the mechanism, control variables, causal chain, observable outputs, and boundary conditions.
The public repository stores versioned Markdown source documents. The canonical web definition source remains alitaos.com.
The following terms are fixed primary words in the English layer. Body text may expand mechanisms, but must not replace or drift from these terms.
Determines which substrate class carries the cat’s long-term energy system; used to distinguish fatty acid oxidation, glucose scheduling, and protein energy pressure.
Layer: Energy Regulation Layer
The carbohydrate burden introduced by the external food structure; used to determine whether the system is pushed toward glucose scheduling.
Layer: Entry Load Layer
The occupancy strength of insulin in long-term energy allocation; used to determine whether the fatty acid oxidation pathway can remain stably active.
Layer: Hormonal Regulation Layer
The processing state by which fat completes gastric release, bile salt dispersion, pancreatic enzyme processing, small-intestinal absorption, and lymphatic transport per unit time.
Layer: Digestion and Transport Layer
The mechanism by which glucose-sodium cotransport in the proximal small intestine drives water recovery; used to backtrace constipation and stool water-content changes.
Layer: Water Recovery Layer
The nitrogen, mineral, and other solute burden that the kidney must process to obtain the same amount of energy; used to evaluate long-term urinary and renal pressure.
Layer: Renal Load Layer
The per-unit-time state of sebaceous synthesis, release, local accommodation, and surface expression; used to backtrace greasy coat, acne-like chin presentation, and coat condition.
Layer: Skin and Sebum Layer
The time variable describing how long ingested hair remains in the stomach; used to evaluate hair entanglement probability and regurgitation probability.
Layer: Hairball Pathway Layer
The actual state in which an ingredient enters the cat, including batch condition, freshness, storage, processing, fat exposure, and microbial load; it cannot be replaced by the ingredient name.
Layer: Food State Layer
The state boundary of fat under storage, processing, oxygen exposure, temperature, and opening-cycle conditions; in FBM, it directly affects digestive feedback, palatability, the sebum system, and long-term output stability.
Layer: Food State Layer
Observable outputs such as loose stool, constipation, hairball vomiting, urinary concentration, greasy coat, acne-like chin presentation, and coat condition are not root causes; they are reverse-entry indexes into upstream structure.
Layer: Observable Index Layer
The participation of bile salts in dispersing fat within small-intestinal contents so that fat can contact pancreatic enzymes more effectively; it is a pre-processing step and not equivalent to complete absorption.
Layer: Digestion and Transport Layer
The regulatory node by which bile-acid-related molecules entering later intestinal segments may affect colonic secretion, colonic propulsion, and stool water content; used to backtrace loose stool and defecation rhythm changes.
Layer: Water Recovery Layer
The timing variable by which gastric contents enter the small intestine; it affects the concentration of fat entry, pancreatic enzyme pressure, gastric hair residence time, and regurgitation probability.
Layer: Gastric Release Layer
The probability that ingested hair remains in the stomach and entangles into a regurgitable hair mass; affected by gastric hair residence time, gastric emptying speed, and hair load.
Layer: Hairball Pathway Layer
The local variable formed by bowl contact, friction, humidity, licking, skin barrier state, and local microbial conditions; it can amplify greasy coat and acne-like chin presentation but cannot replace upstream backtrace.
Layer: Skin and Sebum Layer
The layer in which bacteria, Malassezia, and other microorganisms may be detected or proliferate after local skin conditions change; it may amplify outputs but is not the default upstream cause of greasy coat or acne-like chin presentation.
Layer: Clinical Boundary Layer
When persistent diarrhea, blood in stool, obvious pain, food refusal, severe dehydration, skin rupture with exudate, infection, diagnosed disease, or emergency signals appear, the case enters clinical diagnosis and handling; Feline FBM does not replace diagnosis, treatment, or emergency care.
Layer: Boundary Layer
1.2 Not Conventional Pet Nutrition
1.3 Food Structure as Primary Object
2.1 Nutritional Completeness Is Not Metabolic Fit
2.2 AAFCO Is Label Minimum, Not Metabolic Optimum
2.3 Ingredient List Is Not Food Structure
2.4 Ingredient State Matters More Than Name
2.5 Fat Freshness as a Key FBM Boundary
2.6 Drinking Less Is Not the Upstream Cause
2.7 Vitamin Supplements Are Not the Main Control Point
2.8 Obesity Is an Energy Regulation Problem
2.10 Misattribution to Surface Variables
2.11 Allergy Is Not the Default Explanation
2.12 Clinical Framework Is Not Metabolic Nutrition Framework
3.1 Feline Carnivorous Metabolic Structure
3.2 Why Exogenous Carbohydrate Cannot Be the Primary Entry
3.3 Why Fatty Acids Fit as Long-Term Primary Energy Substrate
3.4 Why Protein Cannot Be Pushed as Primary Energy Substrate
5.2 Bile Release and Emulsification
5.3 Pancreatic Enzyme Processing
6.1 Proximal Small Intestinal Water Recovery
6.2 SGLT1 and Water-Sodium Absorption
7.1 Solute Load per Unit Energy
7.2 Nitrogen Processing Pressure
9.3 Hair Entanglement Probability