There is no actual rule about this. In my experience children are liable to one day decide that they no longer like a thing that they used to enjoy eating all the time.

Wtf am I supposed to do with all these string cheese stickes now? I literally buy them in bulk and she suddenly decides she doesnt like them anymore right after I restocked!

The other one has also declared that balony is gross, after enjoying a balony sandwich for breakfast several times a week for over a year. But thats fine I guess, balony isnt healthy and it is indeed kind gross, but also I still like it and will eat what he doesnt. The problem is that he instead wants avocado toast for breakfast. Hes only 7 and already ruining his chances of ever owning a house.