Hi Susan, I saw your post on the Lantus/Lev support group and thought i'd track you down. What insulin are you using? That can make a difference in when the diabetic cat should be eating. With some of the quicker acting insulins it's important for food to be "on board" when the shot is given. They work quickly so you want the timing to be fairly close together. With Lantus and Lev, you do want the cat to eat some within the 2 hours after the shot. Most people test, feed and shoot at the same time, but as long as the cat is eating reliably, it's ok for the diabetic cat on Lantus/Lev to graze. You probably want to pick up the food a couple of hours prior to the next shot (at +10 in the cycle) so that the preshot test doesn't show a food-influenced number (ie, the preshot test isn't higher because the cat just ate, which is going to wear off soon) just for safety.
Does that make sense? So in other words, if your cat is a grazer and will just nibble and walk away, then come back to it, it's ok with Lantus/Lev to leave the food down until +10. Then pick it up and let him wait the last 2 hours before his next shot without eating. Put the food down with the next shot and repeat.
For some cats, they'll eat every bit of the food the moment you put it down - mine was one of those - and if a cat on Lantus/Lev eats a large quantity in the later part of the cycle (say after +6-7 or so until the next shot) that can act like a brake on the action of the insulin. Depends on how much food it is. It's waning in the second half of each 12 hour cycle. For those cats it can be better for them to have most of their food in the first few hours after each shot. I fed punkin 3oz with his shot and 1.5oz at +3 for both cycles. Other than that, I simmered chicken breasts, diced them small and froze most, kept a couple of tablespoons in the fridge and gave him those for pokey treats. When he was really hungry in the second half of the cycle, i gave him a few pieces of chicken.
Do you need a hand getting a spreadsheet going for your little guy?