3.4 Why Protein Cannot Be Pushed as Primary Energy Substrate

Protein is essential as structural material and amino acid supply, but pushing protein into long-term primary energy duty increases nitrogen processing pressure and Solute Load per Unit Energy.

Protein is necessary. Protein is not the ideal Primary Energy Substrate. High protein percentage is not equivalent to Feline FBM.

Protein energy pressure links to renal solute load and must be read per unit energy, not as isolated nutrient percentage.

Degree to which protein is forced beyond structural role into energy duty.

Whether fatty acids or carbohydrate dominate scheduling instead of protein.

Renal burden evaluated relative to energy supplied.

When fat contribution is insufficient, protein pressure rises.

upstream food structure pushes protein into energy duty

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protein energy pressure rises

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nitrogen processing and renal solute load per unit energy increase

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urinary concentration and related outputs as backtrace signals

Urinary concentration patterns may reflect solute load per unit energy when protein carries excess energy demand.