Never saw that in Lucian, but then Lucian isn't normal. Back when he stayed sky-high, he ate like a horse and I understand that as being the cat is starving. When the numbers are very high they can't utilize the nutrients in the food so they are physically starving even though they are eating. Back then, he was eating 2-3 5.5 oz cans a day. He eats about half that now, even though he's still running too high, nothing like it was at the beginning.
When ever you are having to give snacks for low numbers, you should always give very small snacks, like 1-2 teaspoons at a time about every 30 mins while testing. Since it takes sometimes hours to get steady again, they have to be hungry. If you give them what they want at the first low number, they won't want anymore and they need it sometimes for hours.
That's a mistake a lot of newbies make, they see a 40 or some other low number and feed the cat a whole can of food, out of fear. Then, an hour later it's back at 40 or less and the cat won't eat because he's full. Don't make that mistake, it's very difficult to feed a cat that is already full.
I never did that, I saw a couple people on the forums scared to death because the cat wouldn't eat while in low numbers because they fed too much. I learned from their mistakes.

And I have spent many nights and days dealing with hypo watch with Lucian. Can't even tell you how many times I was up all night with him and helping others with the same problem. Mel too! We've pulled some all-nighters together, both with Lucian and other cats.
'Knowing' is half the battle, knowing what to do IF it happens, makes it run more smoothly when it does happen. Knowledge is a wonderful thing and helps keep you from freaking out or not freaking out as badly.
