Guilty pleasure?
Not only food related!
Could be:
-Watching a TV show that is really bad
-Listening to particular band or genre you'd be embarrassed of listening to it in public
-Reading a book you swore you would never get
Basically it is something that you shouldn't like, but like anyway.
Mine is, when I'm cooking or working I'm listening to the most embarrassing Latin music available, the cheesiest the better.
Edit: Spelling