This is my quick response, I may have more for you tomorrow.
Likely the the food is a problem. It is not OK to guess at the food such as it seems you may be doing with the Publix generic. There are ways to get the exact nutritional contents from the manufacturer. Here are the instructions for that:
http://binkyspage.tripod.com/foodfaq.html
If doing that is not up your alley then I would search for other foods Oreo will eat that are on J&B's list that are below 9% carbs.
http://binkyspage.tripod.com/canfood.html . And of course no dry food. Some of the The Fancy Feast flavors are popular as well as the Wellness grain free flavors, and if your cat will eat them Merrick makes a few excellent flavors that are grain free and very well balanced. The Fancy Feast ones tend to be high in phosphorous which is generally considered bad for CRF/CKD. I'm not sure what the goal of the urinary diet your vet suggested though, it might have been to alter the urinary PH and not lower the P??? I don't know.
As far as the Urinary diet - what food exactly is that? What are the objectives of the urinary diet? Perhaps similar might be accomplished though a commercial diet that Oreo likes that is also good for diabetes. Otherwise there are options like prepping your own to match the requirements. I have not heard for a cat needing a urinary diet because of a UTI but then I don't know everything? Maybe some others here have some input on that.
As for the weight: ideally cats [just as humans] should be fairly slim. Weight can be a big factor in DM with cats just as with humans. Dr. Lisa has some good writing on the topic here:
http://www.catinfo.org/feline_obesity.htm
I would suggest reading her whole site.
I have a way to calculate how much your cat should eat. The spreadsheet is here:
https://spreadsheets.google.com/ccc?key ... nhPTXBEUUE
you would have to save it to your own computer and use it there or upload it into your own google docs. Otherwise you can tell me how much your kitty weighs now and the activity level [indoor or outdoor] and if the kitty really needs to gain weight or is fine where he is and I can do it for you. But if your cat is unregulated then they need food. Free feeding [or the closest approximate] is the best when using longer acting insulins like PZI. If you are unable to free feed because your cat needs caloric restriction then there are timed feeders some use here. Otherwise, I add water to H's canned food to help it not dry out and get the crusties, some here freeze the wet food in ice cube trays.
Thank you for detailing a little more about your kitty. Again, if you could get that
spreadsheet going and the
profile set up as detailed in the tech support forum it would really help others here give you the best advice. :smile: For specific dosing advice the spreadsheet is important.