Waving 'Hi' to you from Surrey!
It can be uncomfortable when our vets suggest one thing and 'those crazy folks on the internet' suggest something else. I think most of us have here have had some experience of that. And there are some of us here who freely admit we have learned to 'nod and smile' and then walk away and do something other than the vet has suggested. I'm one of them. I don't
like doing it. But my experience with my own cat (and with seeing what has happened with zillions of other folks' cats here) has taught me that it is the right thing to do
in this instance.
Don't get me wrong, I really like my vet. And he has provided great healthcare for my animals for quite a few years. But when it comes to feline diabetes....well....that's where our opinions differ just a wee bit....
Many vets
do seem to have a mindset that so called 'prescription foods' are the way to go. But please see the following info written by vet Dr Lisa Pierson. She is an expert on feline nutrition and recommends that diabetic cats eat wet food that has less than 10% of calories from carbohydrates.
http://www.catinfo.org/?link=felinediabetes
Is your cat actually on insulin yet? If so, then that changes things a little bit in that we'd only suggest switching to low carb wet if/when you have learned to test his blood glucose at home (way easier than it sounds!). That's because lowering the carb content of the food can reduce the blood glucose quite a bit; and a dose that may have been OK before could be too much after the diet change.
Ultimately, what you feed is your choice, of course. You have to feel comfortable (or as comfortable as you can be in the circumstances) with the choices you make. And any decision you make now won't be 'set in stone'. You can always change your mind later....
Eliz