McCartney, 59, who is ready to hit the road again for the first time in eight years, says being vegetarian for the past quarter of a century has kept him going strong.
The singer-songwriter became vegetarian more than 25 years ago along with his late wife Linda.
``The benefit of a vegetarian diet is that it gives you more energy,'' McCartney said in a statement released in London at the start of Britain's National Vegetarian Week.
``That's certainly the case with me, seeing as I'm now looking at going out on tour again at an age when most people are thinking of retiring.''
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