A raw diet will discourage the development of diet-related diseases such as kidney failure and diabetes, yes. I recommend doing more research here for advice on how to make a balanced raw diet at home - there's some basics to learn, but after that it is not that hard, and very rewarding!...
And as far as bone causing diarrhea - actually it has the opposite effect, constipating if there's too much bone. Cats often get diarrhea at first if they are adjusting to any kind of diet change, so don't quit because of that.
Last edited by Fran; 02-12-2011 at 04:28 PM.
Reason: Remove redundancy :)