Beyonce and Jay Z are swapping beef for the leaft! That's right the power couple are going green for the next three weeks and we have all the details on their vegan diet! Jay announced the big diet news on his website, Life and Times. "Psychologist s have said it takes 21 days to make or break a habit. On the 22nd day, you've found the way." Thus, Hov's 22-day challenge to go completely vegan, or plant based, as he prefers to call it! The rapper's friend, Marco Borges, an exercise physiologist, was the one who challenged him to the vegan diet! Turns out Jay decided to start the cleanse right in time for his 44th birthday, and he even got wife Beyonce to join in on the fun! Lucky for us, Jay Z will be sharing his progress along the way!