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Resting Energy Requirement is calculated via Kleiber's Law: RER = 70 × (Body Weight in kg)^0.75, representing basal metabolic turnover at rest.
Patients above ideal BCS (5/9) receive a negative adjustment factor (-5% per BCS point) to encourage safe adipose catabolism without inducing hepatic lipidosis.
Calorie density determines physical gastric volume needed to deliver adequate nutrients; low-density foods risk volume insufficiency in high-demand animals.