Out of my 11 cats, I've got 3 who are now underweight after switching to low carb (<7%) canned food. Unfortunately, 1 of them is Spitzer, the diabetic.
For now, those 3 cats are getting a pinch of the remaining dry food I have twice a day while I search out an easily obtainable low carb, slightly higher fat than either the Fancy Feast or Special Kitty I've been feeding have.
It is taking me some time to do the market research because I am recovering from acute vestibular neuronitis (24 hours in an ER, hooked to IVs), which has left me with unpredictable, acute, brief, episodes of vertigo and imbalance. I have to be careful going anywhere, because I don't know if, or when 1 of these episodes will hit. (I needed this like a hole in my head, y'know?)