It depents on your stomach. If you are well traveled or like to experiment, you should be able to eat anything; and if you are healthy enough for it.
I grew up eating different foods and every month we tried a different restaurant. But after over 20 years of drinking too much coffee, my stomach doesn't do well with a lot of stuff. Amazingly I can still eat spicy food, but anything with a lot of creme or grease in it will become an issue.
With animals (pets such as dogs, cats, etc) we usually recommend to stay with the same food; especially with those that have sensitive stomachs. Unless they are used to changes.
I really don't go by what I am used to. I like to try new things and eat what I like. Only limit is my wallet and my imagination. But unlike Andrew Zimmer, there are certain things even I wouldn't touch!