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Ellen Degeneres - The 'Ellen' host was one of the most famous vegans on the planet for years and is a beloved by PETA. But that's just where the story begins.

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Shoes - Ellen had a section of her website about how to become vegan for while, but it was later taken down. Her vegan fan base became agitated when Ellen began working with CoverGirl, who tests on animals, and released a shoe line that used leather.

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Reveal - In 2012 Ellen let it slip that she eats eggs from her neighbor's yard. Then in 2016 Ellen confirmed she wasn't vegan.

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Samuel L. Jackson - In August 2013, Samuel L. Jackson became vegan, reportedly because he wanted to "live forever," according to a New Zealand news site.

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'Tarzan' - On the set of 'Tarzan,' Jackson was told he had to gain 20 lbs (9 kg) for his role as George Washington Williams. If he didn't he'd be fired, Jackson said in the same interview.

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Lost weight - Jackson had lost 40 lbs (18 kg) after becoming vegan, so in order to gain the weight back for his role he began eating meat again in 2015.

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Natalie Portman - The actress is among the more outspoken vegans in the world, going on TV shows to promote the lifestyle. She even did a documentary called 'Eating Animals.'

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Pregnancy -

But in 2011 when the star was pregnant, she revealed that her cravings for dairy became overwhelming. Portman was very public about her change of diet at the time. 

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Vegan reborn - But Portman came back to veganism after her pregnancy, and is back on the circuit to promote the non-animal product or byproduct lifestyle.

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Bob Harper - The case of workout guru and actor Bob Harper is a complicated one. The 52-year-old trainer and host of 'The Biggest Loser' was outspokenly vegan for many years until 2011.

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Heart attack - Then he came out to say he'd been cheating as a vegan, and eventually gave up the lifestyle. But in 2017 the trainer had a heart attack due to a genetic condition, inspiring him to go back to veganism.

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Fish - But not two months later, Harper posted a photo on Instagram of him eating fish at a restaurant. Harper is clearly generating a fair amount of news about his rapid dietary changes.

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Carrie Underwood - The country star has called herself a vegan for years, but questions surrounding the strictness of her diet have grown louder recently.

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Pregnancy - Underwood ate dairy during her pregnancy, but said she'd returned to veganism afterwards. But that's not exactly how it worked out.

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Mostly vegan - After learning that sometimes eating dairy and meat doesn't count as vegan, she's reverted to the line that she's "mostly vegan." Underwood has repeatedly stated that she wants to be vegan, but is still getting there.

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Anne Hathaway - Anne Hathaway was a strict vegan for years, but much like Samuel L. Jackson, a role posed a challenge to her diet. 

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'Interstellar' - Wearing a 40 lbs (18 kg) space suit in 'Interstellar' underwater was a challenge for Hathaway. She said she began craving fish swimming in a nearby stream, according to Harper's Bazaar.

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Gave up - Hathaway gave up veganism during the film and hasn't looked back, saying that she feels better now.

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Derek Hough - Professional dancer of 'Dancing with the Stars' fame, Derek Hough made a major splash when he announced he was going vegan. But he didn't reveal all when he made his announcement.

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L.A. - His announcement became relatable for many when he pointed out that it was hard not to be a vegan in Los Angeles. However, apparently it wasn't so easy for Derek.

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Six weeks - Derek only lasted six weeks as a vegan, prompting questions about why he made the announcement public in the first place. 

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Fleur East - British singer Fleur East made a big show of her new vegan diet in September 2017 on Twitter. But things got even more public for her on reality TV. 

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'Im a Celebrity...Get Me Out of Here!' - In the 2018 season of the UK show 'Im a Celebrity...Get Me Out of Here!,' Fleur East got out of a challenge that involved eating cockroaches due to her veganism. She didn't get out of eating a marsupial however.

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Wallaby Wings - Later on in the reality TV show, the singer is seen eating Wallaby Wings, an Australian dish that is certainly meat. Viewers were outraged, and East later announced she wasn't vegan.

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Alex Jamieson - If you watched 'Supersize Me,' you might remember that Morgan Spurlock's then-girlfriend, now-wife was a well-known vegan chef. Alex Jamieson (left) began a vegan lifestyle back in 2000.

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Advocate - A longtime advocate of the vegan diet, she made her living by writing cookbooks and books about wellness. But after 13 years, things changed.

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Started eating meat - After 13 years of being vegan, Jamieson gave it up in 2013 after she began to crave meat. She publicly announced the change, and wrote a book about it.

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Waka Flocka Flame - Most people didn't know the rapper was vegan until he publicly announced he was ditching veganism, stating that vegans were like the police.

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Conscious eater - Waka Flocka Flame now calls himself a conscious eater, but said he stopped calling himself vegan because of its elitism.

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Honey - What may have sparked the change is when Waka Flocka Flame heard vegans aren't supposed to eat honey, which he called going too far.

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