McCartney explained that he became a vegetarian after a fishing trip. The singer says that it was during this trip that he realized the importance of life for fish.
McCartney shared his reasons for not eating meat on a poster for PETA (People for the Ethical Treatment of Animals), reports FemaleFirst.
McCartney said, "Many years ago, I was fishing, and as I was reeling in the poor fish, I realised, ‘I am killing him – all for the passing pleasure it brings me.’ Something inside me clicked. I realised, as I watched him fight for breath, that his life was as important to him as mine is to me."
Several other celebrities have posed for PETA, including Alicia Silverstone, Casey Affleck, Forest Whitaker and Joss Stone.