This study was done using dogs but, I imagine results would be similar for cats. Not only creatinine levels, but BUN and hematrocrit levels are also higher in those that are raw fed.
Quote:
Preliminary statistical comparisons of
results for the raw and cereal-based diets found them to be essentially the same with the
following notable exceptions:
• Higher packed cell volume (hematocrit) in all raw diet fed groups (range of 51.0 ± 6.6 – 53.5 ±
5.6 %) versus cereal-based kibble (47.6 ± 6.1 %).
• Higher blood urea nitrogen (BUN) in all raw diet fed groups (range of 18.8 ± 6.9 – 22.0 ± 8.7
mg/dL) versus cereal-based kibble (15.5 ± 4.7 mg/dL).
• Higher serum creatinine in the Volhard raw diet group only (1.20 ± 0.34 mg/dL) versus cerealbased
kibble (1.07 ± 0.28 mg/dL).
While a more detailed analysis of other parameters has yet to be completed, initial results indicate
that dogs fed raw meats (natural carnivores) have higher red blood cell and blood urea nitrogen
levels than dogs fed cereal-based food (obligate omnivores). Thus, the normal reference values for
dogs fed raw food diets should probably be revised.
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http://www.homevet.com/petcare/docum...enutrition.pdf
I hope this provides some explanations for you and that Puddles isn't really experiencing early stage renal failure
.