Vegan Month: why your favorite celebrities went vegan

Ellen Page - The actress is a longtime vegan, with many reasons for the veggie lifestyle. Her main reason though appears to be social justice, as she asked "why are vegans made fun of while the inhumane factory farming process regards animals and the natural world merely as commodities to be exploited for profit?" according to Elle UK.

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Russell Simmons - "Well, it started with my yoga practice and you know, the practice of non-harming, 'ahimsa,'" Simmons told Al Roker on Today. "So I became a vegan because [of] compassion [for] the animals ... The vegan diet was being discussed around me all the time, so finally, I just made the choice." Namaste.

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Ariana Grande - The recording artist has been vegan since 2013, and she has stated, "I love animals more than I love most people, not kidding." However she has also mentioned the health benefits.

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Joan Jett - The iconic rocker has been vegetarian since the 80s. She now claims that besides minor amounts of honey and butter that she eats, she's "very close to vegan."

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Tobey Maguire - The actor has been vegan since 2009, and if Spider-Man is vegan, then everyone should be.

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Joaquin Phoenix - The actor has been vegan since age 3! He went on a fishing trip, and after seeing them squirm, he quit animal products. He is also the narrator of the documentary 'Earthlings,' Phoenix has shown the importance of conscious eating and converted many of his famous peers as well.

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Peter Dinklage - The 'Game of Thrones' actor has been vegetarian since childhood and has now switched to vegan.

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Mayim Bialik - 'The Big Bang Theory' actress is another vegan star. She even has her own cookbook!

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Morrissey - The longtime vegetarian was famous for proclaiming "meat is murder!" He switched to a vegan diet in 2015.

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Pamela Anderson - The sexy starlet is a vocal vegan advocate and is noted for her provocative advertisements with PETA.

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Stevie Wonder - Stevie Wonder even sang about his vegan values!

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Jared Leto - "Well, there was a time when we used to sacrifice goats, but then we all became vegans, so we've been sacrificing tofu before the shows!" The actor and musician said, according to PETA. All hail soy protein.

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Bryan Adams - Bryan Adams stated it very simply when he said in an interview that "animals are friends and I don't eat my friends."

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Kate Mara - Kate Mara's reason for going vegan is three-fold: better health, better environment, and better treatment of animals.

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Rooney Mara - The recording artist has been vegan since 2013, and she has stated, "I love animals more than I love most people, not kidding." However she has also mentioned the health benefits.

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Casey Affleck - The 'Game of Thrones' actor has been vegetarian since childhood and has now switched to vegan.

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James Cameron - The director of 'Titanic' is in it for the environment, as well as health reasons. He even made a documentary about vegan athletes called 'The Game Changers!'

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Sia - A prominent vegan since 1998, the 'Clueless' star said in an Oprah interview that not eating animal products has dramatically benefited her health.

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Alec Baldwin - Portman decided to go vegan because she feels very strongly about the negative effects of factory farming.

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Demi Moore - The actress is not only vegan but raw as well!

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Emily Deschanel - The actress is a longtime vegan and a supporter of animal rights issues.

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Dawn Richard - The musician turned vegan to better her health after her father was diagnosed with cancer.

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Mya - Mya initially became vegan to challenge her willpower, but after seeing the health benefits, she's not going back! She has even released a line of vegan wine.

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Al Gore - No surprise that the former vice president and environmentalist is on a green diet.

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James Cromwell - The actor and animal rights activist became vegetarian after working on the movie 'Babe.' How could you not be when you've met the gallant pig!

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Travis Barker - The drummer is a longtime vegetarian but due to a serious health scare is now vegan.

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Moby - Moby became a vegetarian because he loves animals and didn't want to contribute to their suffering. He became a vegan in 1987.

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Evanna Lynch - The 'Harry Potter' star said in an acceptance speech for her Burke Medal, “killing and eating animals is a betrayal of our own core humanity,” adding, “killing an innocent goes against our nature."

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Bellamy Young - The 'Scandal' star is a longtime vegan due to strange circumstances. She changed over because she was once served a chicken breast that reminded her of her mother's dog when it rolled over for pets.

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Petra Nemcova - The model went vegan after hearing about fish depletion.

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Jessica Chastain - As a vegetarian of 15 years and vegan of 8, the actress says that she doesn't want to be contributing to the cruelty in the world.

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Alicia Silverstone - A prominent vegan since 1998, the 'Clueless' star said in an Oprah interview that not eating animal products has dramatically benefited her health.

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Russell Brand - Went vegan after watching the documentary 'Forks Over Knives' and tweeted, "I'm now vegan, goodbye eggs, hello Ellen."

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Natalie Portman - The actress decided to go vegan because she feels very strongly about the negative effects of factory farming.

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Ellen DeGeneres - The talk show host is a robust vegan advocate and works to bring the discussion to a mainstream audience.

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Portia De Rossi - Joining her wife, Ellen, this 'Arrested Development' star went vegan, and reaped incredible health benefits.

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Miley Cyrus - The outspoken star went vegan in 2014 for her household pets, "I realized these are intelligent animals," she told Jimmy Fallon.

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Liam Hemsworth - Hemsworth told Men's Health that Woody Harrelson was one of his inspirations to go vegan. It also probably makes sharing food with his lady, Miley, easier.

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Woody Harrelson - Harrelson chose to go vegan out of compassion. According to Bustle, he just wants everyone and everything to "live harmoniously."

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Olivia Wilde - Wilde has been a vegetarian since the age of 12. The actress is now a prominent vegan activist and has her own website promoting the lifestyle.

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