Yay! I knew you would come to it in your own time.
And, I am so glad you found a vet that apparently knows a little more about this.
As Veronica said, you may need to try different ones before you find what Mogee likes. Dr Pierson's food chart is VERY helpful (here is the direct link to the one with filters:
http://catinfo.org/chart/index.php). She recommends starting with these filters:
Protein - min 40%
Fat - max 50%
Carbs - max 10%
Phos - less than 300 (this is primarily for cats w/kidney issues, but I figure if this is better for the kidneys, it has to be better for all cats)
I wanted the carbs a little lower and protein a little higher, so I used 5% on the carbs (which automatically did away with all the lower protein foods) and used her recommendations on the others. Since it is not a good idea to feed a cat fish regularly, I looked through the remaining list for foods that were not fish (which brings the list down a lot). I also have a cat, Willow, who is allergic to turkey, so I had to rule those out, too. Then, I started buying/trying the few foods that remained. In my case, it was hard to find anything they would eat enough of. Of course, they also had the difficult transition of going from all dry food their entire lives to all wet. As much as I wanted them to like things like Weruva's Paw Lickin Chicken or Tiki Cat Puka Puka Luau, they just did not. So, I had to go back to the list and change the criteria slightly until I finally found something they will eat enough of consistently which is Fancy Feast Classic Chicken Feast. So, I guess what I am saying is start out with the 'ideal' selections, but you may have to dial it back some to actually land on something he will eat.
As far as the dose decrease, that depends on several factors including how fast you are going to change his food. If you are going to slowly transition, the dose increase probably does not need to be as much as if you are switching him all at once. You could read what Dr. Pierson says about this (catinfo.org) . There is one quote on her site that says, "
High-protein, low-carbohydrate diets and low-fiber diets are highly beneficial in the management of cats with diabetes, resulting in a reduction of > 50% in the amount of insulin required in 8 of 9 cats in one study." So, if I was having to 'guess' at what to do, I might go with 2 units instead of 4 if you are switching completely to low carb right away. You can always go back up some after a few days, if needed.
Whatever you decide, the most important thing is that you do this at a time when you can be there to monitor him, just in case. Let us know how things go.
