Carly—how often are you feeding Maci? Some vets recommend twice a day for diabetics but it’s much better to feed multiple small meals (less stress on the pancreas) than two large ones. Human doctors tell their Type II diabetic patients the same thing. If you do happen to be feeding only two meals, try breaking them up and see if that smooths out the BG numbers.
As long as you’re not giving insulin shots, you really shouldn’t have to worry about Maci’s BG dropping too low.* I’d stick to feeding only low-carb canned food and avoid dry altogether (including D/M dry). The normal-range numbers are where the pancreas can heal.
And finally, some cats get tired of D/M. There’s really nothing magical about it (the “D” stands for “diaTetic”, not diaBetic—and yes, there’s a story regarding the wording change, lol). It’s fine to feed other low-carb canned foods than D/M.
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* for anyone who wants to get technical about this statement, yes, an insulinoma or other rare scenarios can cause hypoglycemia BUT they’re not worth mentioning in this case (even though I just did

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