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http://www.catsofaustralia.com/cat-kidney-disease.htmDiet for Kidney Failure in Cats: The Protein Controversy
You may have heard that restricting protein is recommended for cats in kidney failure. Although this has been the "standard" treatment for decades, as far as cats are concerned, it has always been--and remains--very controversial. According to experts at Colorado State University's veterinary teaching hospital, restricted protein does not prevent kidney failure in a healthy cat, and has no effect on the ultimate progression of renal disease. Research also shows that even very high protein diets do not make renal failure worse in cats (although high protein does worsen the disease in dogs and humans). (One pet food maker recently completed a study it claims shows that its restricted-protein diet increases lifespan in CRF cats. However, because the study has not yet been published, it is impossible to evaluate the data, which is contradicted by other research.) The real culprit is actually phosphorus, which meat contains in large amounts. Decreasing phosphorus intake (by restricting protein) can help some cats feel better, so it may be worth a try in a symptomatic cat.
However, some studies have suggested that excessive restriction of protein may actually cause further damage to the kidneys and other organs, because there is not enough protein for normal body maintenance and repair. Experts say that these diets are not appropriate until the BUN (Blood Urea Nitrogen) is at least double what it should be normally (about 60-80 mg/dl).
Furthermore, there is one big problem with using the protein-restricted commercial diets: many cats don't like them, and won't eat them. Obviously, it does little good to provide a special diet if the cat is going to starve to death! Experts emphasize that it is much more important to feed the cat what he likes and will eat, and maintain weight and body condition, than to be overly concerned about protein content. (Please note that if you add any other protein source to the diet, it will completely negate any possible beneficial effect from the low-phosphorus renal diet. It is useless to feed both a renal diet and a normal protein food or meat-based treats at the same time.)
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