Therapeutic weight loss diets for cats should be compared on protein content expressed as percent metabolizable energy (ME), with high-protein defined as ≥40% ME for diabetic cats and 54.2% ME representing the high end of studied ranges in calorically restricted overweight cats. A moderate-protein comparator in the same restriction model was 31.5% ME, and only cats fed the higher-protein diet maintained lean mass during weight loss despite both groups losing weight at a similar rate. Journal of Anim…

Protein content is the primary differentiator for lean mass preservation. Feeding a high-protein diet to calorically restricted overweight cats prevents significant decreases in mass-adjusted total and resting energy expenditure, an effect not seen with moderate-protein diets. Journal of Anim… Protein also contributes to a negative energy balance through its thermic effect, increasing postprandial metabolic energy expenditure. American Journa… For diabetic cats specifically, a high-protein diet (≥40% protein ME) is recommended to maximize metabolic rate, limit hepatic lipidosis risk during weight loss, improve satiety, and prevent lean muscle-mass loss. AAHA Clinical G…

Satiety comparison between diets is best assessed by voluntary energy intake rather than gram weight intake. When two commercial feline weight loss diets were compared, cats consumed 17% less energy on the higher-fiber, lower-fat diet (F1) versus the comparator (F2), despite no difference in gram weight consumed — F1 contained 35% more total dietary fiber and 32% less dietary fat than F2, with similar protein content between the two. BMC Veterinary…+1 The same diet that reduced voluntary energy intake was also preferred by cats in palatability testing. BMC Veterinary…

Fiber content amplifies the satiety effect of protein. Increased protein and fiber contents are complementary in providing enhanced satiety, which reduces begging and other food-seeking behaviors that drive owner noncompliance. Journal of the…+1 High-moisture diets for cats may additionally increase satiety and help promote weight loss. AAHA Clinical G…

Veterinary therapeutic weight loss diets safeguard nutrient intake better than over-the-counter (OTC) low-calorie or adult maintenance diets during energy restriction. OTC diets result in more amino acid and vitamin intakes falling below National Research Council (NRC) recommendations compared to veterinary formulations. American Journa… When obese cats are restricted to resting energy requirement (RER) or 0.8 × RER for ideal body weight, veterinary weight-loss foods are the recommended starting diet. American Journa… Nutrients at particular risk during restriction include selenium, choline, potassium, and riboflavin, even with veterinary therapeutic diets. The Veterinary…

After successful weight loss, the therapeutic weight management diet should continue to be fed during the maintenance period rather than transitioning to a standard maintenance diet, because therapeutic diets contain more protein and micronutrients relative to ME content and are formulated to promote satiety and decrease food-seeking behavior. The Veterinary… Approximately half of cats regain weight after weight reduction, with over half of those regaining more than 50% of the weight originally lost. The Veterinary…

Would you like guidance on how to calculate the starting energy restriction target (RER vs. 0.8 × RER for ideal body weight) for an obese cat beginning a weight loss plan?