I hear that! I used to believe it, too. Then later I realized there's a fair # of vets out there who know precious little about effectively treating diabetic cats. Not that I'm bashing them, understand. But they're just like a lot of human docs: So busy that they don't always find time to read the latest literature/ treatment protocols on a certain disease. When first dx'd, my Colorado vet sent us home with Lantus, D/M canned (3%) and D/M dry. I had to find out on my own (via reading online @ FDMB site) about the catinfo.org cat food comparison doc. When I saw that carb # for the dry D/M formula, I went, "Whaaaaaat???!!! Told the vet; he was astonished; said, "Wow, let's transition her off that dry formula!" So he and I both learned something. (Thanks, FDMB folk! It was really your info that helped me get her off Lantus faster than I otherwise could have - if at all, if I'd kept feeding her that 31% stuff!)