That is interesting. A VERY KNOWLEDGEABLE lady I know suggested putting MY babies on a lower phosphorus food as they are no longer youngsers (well they are 6 & 7 and ?) but Vet said there was no study to say doing that held off CRF.

Now my Panther, at age 6 has had numbers just a tad above normal and yet his USG is 1055! He is not on a kidney diet but on an Adult diet with a phos just over 1% and as he gets older - even IF he does not have any worsening numbers I will change foods to lower and lower phos.

Interestingly though, my oldest cat, Kotton - SHE has the lowest numbers of all!
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Heidi - mom
Kotton - LOVING Ice-blue-eyed Siamese girl
Ben - Young Mr. Wonderful Spotted Tabby boy
Panther - Young Black "Master of Da Bird" boy

3 SPECIAL AngelsPLUS one EXTRA special girl

Minnie -CA LICO Saint of a Kitty girl
Schatzi- LOVINGEST EVER Tuxedo Standard Poodle Boy
Corkie - BEST EVER - cat - & LOVE OF MY LIFE
PLUS the MOST COURAGEOUS Little Angel EVER
Princessita Missy - Tiny MOST Amazing Miraculous Silver/white - Kitty girl EVER!