1.3 Food Structure as Primary Object

The judgment object of Feline FBM is food structure.

Not an ingredient list. Not a single nutrient. Not a label claim. Not a one-point label such as “high fat” or “low carbohydrate.”

Food structure means how substrates, physical state, fat state, energy density, mineral structure, and processing-storage state combine to form the metabolic input structure that enters the cat.

The same ingredient name does not equal the same food structure. The same nutrient percentage does not equal the same operating state.

This page belongs to the definition layer. It states what Feline FBM judges before mechanism pages expand control variables.

Core definition of this page:

Feline FBM does not judge what food “looks like.”

It judges how food runs after it enters the cat.

Food structure first determines which substrate carries energy over the long term. Different primary substrates produce different scheduling paths.

Exogenous carbohydrate sets glucose scheduling and insulin regulation pressure. It is an upstream entry variable, not a ratio-only variable.

Whether fatty acids can be the long-term primary energy substrate depends on fat proportion, fat freshness boundary, fat processing rate, small-intestinal accommodation, and overall food structure.

Protein must be sufficient, but should prioritize structural material and essential amino acids rather than long-term primary energy supply.

How much nitrogen, minerals, and other solutes the kidney must process per unit of energy is an important output of food structure.

Ingredient name is not ingredient state.

Freshness, storage time, processing damage, microbial load, lipid damage, and opening cycle change the state that actually enters the body.

Dry, wet, particle, powder, block form, and fat attachment pattern affect gastric release, gastric emptying speed, small-intestinal accommodation, and stool output.

ingredient list looks good

↓

nutrients complete

↓

food fits the cat

ingredients and raw materials

↓

ingredient state and physical state

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upstream food structure

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control variables

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system operating state

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observable outputs

When two products share similar ingredient names but differ in ingredient state, outputs such as loose stool, greasy coat, or urinary concentration may diverge.

Those outputs should be read as structure signals, not as proof that one ingredient name is universally “good” or “bad.”