David Haye

"I watched a TV documentary about how animals are farmed, killed and prepared for us to eat, I saw all those cows and pigs and realised I couldn't be a part of it any more. It was horrible. I did some research to make sure I could still obtain enough protein to fight and, once satisfied that I could, I stopped. I'll never go back."

David David "The Hayemaker" Haye - the English professional boxer from London and former WBA heavyweight champion - went vegan in December 2013.