2.5 Fat Freshness as a Key FBM Boundary

In Feline FBM, fat is a major long-term energy substrate, so Fat Freshness Boundary is not a cosmetic quality variable. It is a system boundary.

Fat freshness describes the state of fat under storage, processing, oxygen exposure, temperature, and opening-cycle conditions. Instability in fat state can affect digestive feedback, palatability, the sebum system, and long-term output stability.

Freshness boundary is not “fat is bad.” Oxidation or storage damage should be read as fat state instability, not as moral judgment against dietary fat.

This page belongs to the food-state layer and links back to upstream food structure without disclosing formulas or processing parameters.

Extended storage or repeated opening can shift fat state before intake.

Heat, shear, or prolonged processing can alter fat stability before it enters the cat.

Unstable fat state can disrupt Fat Processing Rate and digestive feedback even when fat percentage looks adequate on a label.

Fat state instability may appear in skin-coat outputs through Sebum Processing Rate and local environment change.

Ingredient State includes fat exposure and microbial load alongside freshness.

fat present on label

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freshness irrelevant

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any fat state acceptable

upstream food structure

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ingredient state and fat freshness boundary

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fat processing rate and fatty acid oxidation pathway

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digestive, sebum, and long-term outputs

Soft stool, reduced palatability, greasy coat, or unstable coat condition may signal fat state instability rather than “fat intolerance” alone.

Outputs are backtrace entry points, not root causes.