It is also possible to to set certain foods with specific events that can allow for certain things, all while using the If command. Like how Leifwarfer said, you can set it to anything (within reason) while not having to deal with variables. (This can range from creating timers, turnscripts, etc.)
A bit of warning though, depending on what version you are using will make it slightly annoying to utilize variables. Downloaded Quest seems to be easier while online requires a bit more… brute forcing for some weird reason. While it may look daunting, it actually is very fun to see the sort of physics you can allow on to your character or characters.
Here is a related topic: Quest troubles...