Answer :
Final answer:
The Beatle who gave advice to Lisa Simpson on becoming a vegetarian is Paul McCartney. This happened in a Simpsons episode in which McCartney and his then-wife, Linda, made a guest appearance.
Explanation:
The former Beatle who gave advice to new vegetarian Lisa Simpson is Paul McCartney. In the episode of the Simpsons titled 'Lisa the Vegetarian,' Paul McCartney and his then-wife, Linda McCartney, appeared as themselves. They were instrumental in Lisa's decision to become a vegetarian, providing her with advice and support. McCartney agreed to appear in the episode on the condition that Lisa's decision to stop eating meat would be a permanent character change.
Learn more about Paul McCartney here:
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