You might think you could benefit from shedding a few pounds. But for celebrities, staying fit and healthy is a must if they want to get roles and avoid being forgotten by Hollywood. To that end, they resort to all kinds of ways to stay in shape. Obviously, exercising plays a role. But celebrity diets are usually an even hotter topic of conversation and, let's face it, gossip. And for lots of famous people, the choice they made to adopt a strictly vegan diet. But that's not just a vanity issue. It's also a political and social choice. So here are some celebrities who are vegan, and what lead them to that lifestyle.