Hi there!
Welcome to the KittyCatS Family!
You mentioned your kitties hunger are at 0% & 1%, that means they are happily eating their kibble and not hungry!
The hunger should be as close to 0% as possible. When the cats reach 100% hunger, that means they are starving and will get sick. The cats will warn you that they are hungry & need kibble when they reach 30% hunger.
(Note: It takes 3 days straight without access to kibble they can eat for them to get sick. Though, healing is easy since they auto heal by eating kibble for 7 full days or you can heal sick cats instantly with the Get Well vitamin!)
I hope this clarifies things. We have a manual full of great information, here is a page that goes over caring for your KittyCatS:
https://kittycats.ws/manual/article.php?id=190&oid=50
If you have any further questions, please feel free to reach out to one of our CSRs in world or send me a message in world!