Scout has been diabetic for 3 years, and because of diet change she is 5 lbs lighter !!! and much more active, better coat, etc. than the years before her diagnosis.
As for the vet question, my former vets were so impossible to talk to that I didn't dare show my spreadsheet. Whenever I mentioned the American diabetic protocol, my previous experience with insulin, advice I received from other diabetic cat owners, etc., I was interrupted, my concerns dismissed, and told "Well this is my CLINICAL OPINION and I've been a vet for so many years and I've recently attended a lecture on diabetic care..." I tried to just hold my tongue for my cats' sakes, but eventually I just found a new vet.
When I went to my new vet I was freaking out about bringing my spreadsheet, but she actually sat down and studied it, plotted the glucose curve on paper and compared it with the insulin manufacturer's sample curves, admitted she was not a diabetes expert, did some research on her own, spoke to a specialist, etc. etc. Night and day!
Lori