
"Lisa the Vegetarian" is the fifth episode of The Simpsons' seventh season. This episode establishes Lisa's status as a vegetarian, an idea that was first hinted in the episode "Lisa's Wedding". The episode featured guest star Paul McCartney. One of Paul McCartney's stipulations for doing the guest spot was that Lisa's conversion to vegetarianism be a permanent one. Thus, it is an instance of continuity in the Simpsons universe that has been strictly held to. Around the time this episode aired, David Mirkin, who works on the show, had just become a vegetarian.