With geriatric cats like Badass, which of the following nutrients should be of most concern in regard to overfeeding and causing kidney diseaese?

Question

BlackTom AI · Accepted Answer

Cats are obligate carnivores and protein metabolism places the greatest continuous metabolic load on the kidneys, so excess dietary protein is the nutrient of greatest concern for overfeeding and promoting renal damage in geriatric cats.

1) Relevant knowledge points and concepts
- Kidneys excrete the nitrogenous waste products (urea, creatinine) produced from protein catabolism. Higher protein intake increases renal blood flow and glomerular filtration rate (GFR) chronically, raising the filtration and excretory workload.
- Older cats often have reduced renal functional reserve; chronic excess workload can accelerate loss of nephrons and progression to chronic kidney disease (CKD).
- While phosphorus is important in CKD progression, high-protein diets typically also contain more bioavailable phosphorus, so protein itself is the practical dietary driver of increased renal load.
- Balance: cats need adequate protein to avoid muscle loss, but excess is harmful when renal reserve is low.

2) Step-by-step reasoning
- Step 1: Protein digestion generates amino acids that, when catabolized, produce ammonia which is converted to urea by the liver.
- Step 2: Urea and other nitrogenous wastes must be filtered and excreted by the kidneys; higher protein → more waste → greater filtration demand.
- Step 3: Chronic increased GFR and filtration demand can hasten nephron wear and progressive renal dysfunction, particularly in aged cats with limited reserve.
- Step 4: Therefore, overfeeding protein in geriatric cats poses a primary risk factor for causing or accelerating kidney disease.

3) Calculations
- Not applicable; this is a physiological risk-based explanation rather than a numeric calculation.

4) Why the correct answer is correct
Protein directly increases production of nitrogenous wastes and raises renal workload. In geriatric cats with reduced nephron number and reserve, this increased workload is the most immediate nutritional factor that can promote or worsen kidney disease.

5) Why other nutrients are less correct
- Phosphorus: important in CKD progression, but often linked to protein intake; phosphorus restriction is used therapeutically once CKD is established.
- Sodium: influences blood pressure and fluid balance; hypertension can harm kidneys but sodium overfeeding is less directly causative than protein overload.
- Fat/carbohydrates: contribute to obesity and metabolic issues but are not as directly nephrotoxic as excess protein.

6) Conclusion
Because excess dietary protein increases nitrogenous waste production and renal workload—accelerating nephron loss in aged cats—the correct answer is Protein, matching the provided answer.

With geriatric cats like Badass, which of the following nutrients should be of most concern in regard to overfeeding and causing kidney diseaese?单项选择题

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