our angel is 12 1/2 now and she was diagnosed with stage 2 kidney disease @10 months ago. with everything we've read on the forums, we were a bit paranoid in going 100% Hill's Science Diet and Royal Canin Kidney diets, so although we DO feed her the prescirption stuff (it's @1/2 of her total intake), we do feed her a mix of a lot of other tasty stuff for the other half of her diet. that includes a lot of things we found with under 1% phosphorus content, but still with high protein:
Tiki Cat Molokai Luau
Merrick's BG Purrfect Bistro Cowboy Cookout
Organix by Nature Turkey & Turkey Liver
and for RAW:
Nature's Variety Duck/organic chicken/beef/rabbit
and she also gets little bites of Raw Advantage chicken meat from their chicken necks as well as the beef chunks maybe once/week
as you can see, she gets a LOT of variety-probably more than she really needs, but we like to spoil her
i HAVE heard that the bones in Raw food is high in phosphorus which is one of the reasons some people might avoid it, but i figure (and hopefully i figure right) that if the overall phosphorus level is <1%, then it's probably "OK". plus we DO take out as many of the little bits of bone that we CAN feel out of the Darwin, which is the only one that doesn't really grind them up. Radcat uses eggshell vs. bone apparently for calcium, btw.
Angel just loves the raw so much that we couldn't stop giving it to her all together. she is so much more lively on it and when we started giving it to her BEFORE we found out about the kidney thing, she reacted like a lot of other kitties i've heard about - i.e. she acted like a energetic little kitten again!
anyway, that's been our experience with raw.
p.s. angel also gets a phosphorus binder in her food, takes pepcid for her ulcers (due to the kidney problems i guess), and gets 100 ml of fluid every other night, and she seems to have been stable for the last 10 months. she has another check up in February, so hopefully nothing has changed still...