20 Celebs Who Traded in Cheese For a Vegan Diet

Natalie Portman was so impassioned about being vegan that she took to the Huffington Post to explain why she made the shift from a vegetarian to a vegan activist. For her, it was reading Jonathan Safran Foer's Eating Animals, which sheds light on how animals that make it to our plate are raised, killed, and processed. Natalie briefly went back to a vegetarian diet during her 2011 pregnancy, but returned to a vegan diet after giving birth.