I posted this on your topic on catster. The links won’t work on here but I’ll post it anyway:
A modified raw diet may work. You want to feed more fatty meat than normal. Fat is high in calories and low in phosphorus – I think that up to 1/4 of a cats diet can be fat? Protein isn’t the enemy for CRF cats – phosphorus is. But if you are feeding dry food please stop. That dehyrates kitties so much and CRF cats don’t need that when they are already prone to dehydration.
You could also add a phosphorus binder to the food. I used Aluminum Hydroxide Dried Gel USB powder for Milo and it did help him.
Another thing you may want to consider is giving B12. Alex, one of the members on here, has a site called ibdkitties.net. One of the things talked about on there is giving B12 which I do think is very important for a cat who is getting sub-q fluids because the fluids wash out to much B12 before the cat can use it. Anyway, the article is here. I wish I had known about the importance of B12 earlier. I didn’t know about it till a few months ago – after Milo had to be put down. I’m sure it would have helped him!
Something that can help with nausea is called Slippery Elm Bark. littlebigcat.com Slippery Elm Bark article talks about the uses of it. Again, that is something that helped Milo.
