So glad that Maisy is already feeling better! I noticed the same thing with my cat Max. Once I got his BG under control, he was like a new (much younger ;-) ) kitty. Keep checking in and let us know how Maisy does on the .5u today. You may end up needing to drop her dose even more. When I changed to feeding Max only low carb wet, over about a week his insulin need kept going down (4u to 1u to .5u to .2u), and, as Sue mentions, he eventually went OTJ (into remission and no longer needs insulin). The interesting thing with cats is that, if you get them into normal numbers for a period of time (40-120), their pancreas can sometimes heal and start working again. Anti-jinx! But this may be where Maisy is headed (paws crossed), since she seems to only need a low dose. Keep testing as this will help you know what is happening. Feel free to check out Max's spreadsheet in my signature if you want to see how his dose went down. He was on PZI too.