Meghan Markle Meghan Markle is a self-declared "part-time vegan," according to an interview with Best Health in 2016. "I try to eat vegan during the week and then have a little bit more flexibility with what I dig into on the weekends," she said. Getty Images

Kat Von D The tattoo artist and cosmetics company owner told CL Magazine that veganism "changed" her. "It taught me to look past myselfto consider how my choices affect othersthe animals, the people around me, and the planet we live on. To me, veganism is consciousness." But she's also come under fire for saying on Instagram that she plans to raise her first child as a vegan. Getty Images

Miley Cyrus Miley has a well-documented love of animals and is so committed to being vegan that she got a symbol for veganism tattooed on her body . "Vegan for life!" she shared on Instagram when she got the tat in 2017. Getty Images

Jenna Dewan Jenna told the Los Angeles Times in 2016 that she hasn't eaten meat since she was 11, when she watched something on TV about slaughterhouses. "I certainly encourage veganism, not just for our health, but for the environment and also for the ethical and moral reasons," she said. (Watch her taste test vegan fast food for Women's Health.) Getty Images

Beyonc and Jay-Z The Formation singer famously does a "vegan challenge" every time she gears up for big events or performances. In 2018, she encouraged fans on Instagram to join her in her vegan diet as she prepared for Coachella, and last year, she and Jay-Z promoted the diet again with their free concert ticket contest . Kevin Mazur - Getty Images

Jessica Chastain The Oscar-winning actress told W in 2017 that she started eating vegan after noticing she had really low energy (and some cholesterol problems). After she tried eating vegan for two weeks, "I just had more energy than Ive ever had in my life," she said. "Being vegan was not anything I ever wanted to be. I just really was listening to what my body was telling me." Ki Price/Getty Images

Maggie Q The Nikita actress says that for her, the environmental aspect of veganism is just as important as the health impacts. "When I'm eating, I'm not hurting the planet, I'm not hurting other people on the planet, I'm not hurting other animals," she told PETA about her vegan diet. Getty Images

Madelaine Petsch Madelaine Petsch told People in March that she's been "plant-based" her whole life. "Being vegan keeps my body fueled and running smoothly," she says. (She also drinks up to 13 bottles of water a day, but that's a whole other thing.) Getty Images

Jhen Aiko The singer shared with Into the Gloss in 2016 that she went vegan once for about six months because of some health problems. "Changing my diet like that made me feel like I had so much more energy," she said. But she admitted that being vegan was a lot of work: "At one point, I was going to a place thats really far from my house to get all-vegan everything." She said that she's still determined to make it work, though. "My goal is to totally be completely vegan and only use vegan products, but Im human and I have to work on it daily." Getty Images

Lea Michele The star has gone between vegetarianism and veganism for years. "I keep my home completely vegan, which I think is one of the most important things," she told US Weekly in 2017. "If you keep your home healthy, then, when youre reaching for snacks, youre not reaching for bad things. So, I stock it with fruits and vegetables." Getty Images

Venus Williams The tennis champ has been a vegan since being diagnosed with Sjgren's syndrome, an autoimmune disorder that causes fatigue and joint pain, reports ABC News . But Venus admits she's not the healthiest vegan at times: "I'm not perfect, but I live a plant-based lifestyle," she said. "[Like] french fries are vegan, but just cause it's vegan, doesn't make it the best food choice." Ultimately, though, she's all about taking care of her health: "[I'd also like to] help people live healthy lives. It's so important in my life," she said. "For me it's plant-based lifestyle, for others, maybe it's getting moving more. For everyone it's different. [I'd like to help people] find your healthiest moment." Astrid Stawiarz - Getty Images

Ariana Grande Ariana told The Mirror in 2014 that her love of animals inspired her to go vegan. "I love animals more than I love most people," she said. "It is tricky dining out, but I just stick to what I knowveggies, fruit, and saladthen when I get home, Ill have something else." C Flanigan - Getty Images

Carrie Underwood "I never eat meat and try to eat totally vegan, which is easiest when I cook for myself," Carrie told Cosmopolitan in 2017. "We hardly ever take out or eat out because I don't like to...I like knowing what's in my food, and it's hard to tell when someone else makes it for you." Getty Images

Alicia Silverstone Alicia told Oprah that she went vegan three years after filming Clueless, and she's hasn't looked back. "I used to have all those white marks on my nails and they were very brittle, and now they're so strong I cannot bend them," she said. "My eyes got really white, and I feel like I look less puffy." (Watch Alicia give WH a tour of her vegan refrigerator .) Getty Images

Pamela Anderson In a blog post in 2017, titled " FIGHT FAKE FOOD, NOT FAKE NEWS ," Pamela made the case for eating vegan. "So I say, veganism is about more than choosing not to eat animal products. Veganism is bigger than that. Veganism is about saving animals, saving ourselves, saving our societies, and saving our planet!" David M. Benett - Getty Images

Danielle Brooks Danielle went vegan in 2017. In an appearance on The Chew that September, she said that her Southern, comfort-food upbringing meant that she never learned "how to eat properly, how food is fuel. So this is my way of teaching myself how to eat properly, how to eat to live, I guess." Getty Images

Emily Deschanel The actress has been vegan since her teen years, and got some flak for staying vegan while pregnant. "I still have to defend myself because people dont understand it," she told Ladies' Home Journal in 2011, per People . She's also raising her son, Henry, as a vegan . Getty Images

Ellen Degeneres Ellen Degeneres has been vegan since 2008. "I've always called myself an animal lover. And yet I ate them," she said in a 2012 interview, according to Yahoo . But she said "something snapped," once she learned how chicken and other meat products are made. That said, in her recent comedy special Relatable on Netflix, Ellen noted that she's a little more flexible these days. "In the last year or two for no real reason, I started eating a piece of fish once in a while. Or I'll eat eggs from chickens I knowif they are in someone's backyard or are happy." Getty Images

Portia de Rossi In an essay for O Magazine , Portia wrote that she stopped eating meat after she and wife Ellen Degeneres moved to a farm in California. "I always thought going vegan would be difficult, but I genuinely don't crave meat or cheese. And I feel happier, like I'm contributing to making the world a less violent place." Getty Images

Michelle Pfeiffer The actress credits vegan eating for helping her look her best. "Eating a vegan dietits just so much healthierand you avoid a lot of toxins that could age your skin and your body," she told Urbanette . "I really noticed a difference in my skin not too long after switching to fully vegan." Getty Images

Natalie Portman Natalie Portman feels so passionately about her veganism that she produced and narrated a 2018 documentary called Eating Animals. "There's a reason that food, and food restrictions, are such a big part of every religion," she told California radio station KPCC about being vegan. "Because it is a way that you can state what you believe in and what you care about three times a day." Getty Images

Gisele Bundchen Giselle told W that while sticks to plant-based eating , "I look at whole plant based foods, that's the foundation of the diet, mostly green vegetables, green vegetables are the highlight of that diet." She stays away from refined, processed foods, too: "I believe that if it's not found in nature, we shouldn't really be messing with it." Jackson Lee - Getty Images

Tom Brady Gisele first adopted her healthy diet, and then converted hubby Tom. "He said he's been feeling so much better," Gisele told CBS This Morning in 2017. And Tom is inspiring other NFL players to adopt healthier, even vegan, diets as a result, reports The Boston Globe . Al Pereira - Getty Images

Bellamy Young The Scandal alum told YouBeauty in 2015 that she has been vegan since college. "For me it was the answer to a myriad of things that werent working in my life," she said. "I had terrible cystic acne, no energy at all, I didnt always digest food perfectly." Getty Images

Sia Sia is an outspoken animal rights advocate, and in 2014, she announced on Twitter that she was going " fully vegan ." Getty Images

Erykah Badu The singer told People that she's eaten a vegan diet since 1997. "Its just whats best for my body. If I was a Lamborghini I would want to put the best gas in it," she said. Getty Images

Ellen Page Ellen was named PETA's "Sexiest Vegetarian Celebrity" in 2014 for her vegan diet. She's tweeted before about the prejudices vegans face for the way they eat. Getty Images

Madonna The music icon reportedly follows a strict vegan macrobiotic diet, according to The Cut . Her personal trainer told the Daily Mail that staples in her diet are cold-pressed juices, fruits, vegetables, and whole grains like quinoa. Getty Images

Ellen Pompeo For some people, veganism takes a lot of research and preparation, but not for Greys Anatomy superstar Ellen Pompeo. Last April, the actress went to her doctor for a check-up and came home a vegan, per People . During her annual exam and screening, Ellens doctor told her about her new book which promotes veganism as a way to prevent breast cancer, and Ellen was sold. But that wasnt enough, Ellen got her husband and kids on the bandwagon, too. And while some might struggle with the transition, she told People it was super fun. Getty Images

Ellie Goulding After realizing she could handle her morning runs and go hard during boot camp classes on a vegetarian diet, Ellie said she didnt need meat for fuel. After six years as a vegetarian, she decided to transition to a full vegan diet, per The Cut . Ill definitely never eat fish or meat again, she said. Taylor Hill - Getty Images

Mayim Bialik The Big Bang Theory actress is a vegan, according to PETA , and a proud one, too. Mayim filmed a video to educate non-vegan dieters about what it really means to kick animal products to the curb. She addresses how good vegan food is and gives a shoutout to people who swear they could NEVER give up cheese. Spoiler alert: Mayim thinks you canand should. Paul Archuleta - Getty Images

Evanna Lynch The actress who played Luna Lovegood in the Harry Potter films hosts a podcast about living a vegan lifestyle called The Chickpeeps . On it, Evanna discusses the diet, vegan activism, and eliminating animal products from all aspects of her life, including the dance floor. When she was on season 27 of Dancing With The Stars, instead of wearing leather ballroom dancing shoes, Evanna got herself a vegan pair that she showed off on Instagram, according to Just Jared, Jr . Gregg DeGuire - Getty Images

Rooney Mara Its been eight years since Rooney Mara committed to a vegan diet and four since her closet went vegan too, per W magazine. The Girl With The Dragon Tattoo actress is vegan because she doesnt think its right to hurt animals for human gain. At a certain point I was like, I cant even wear the leather I have. I dont want it in my closet or on my body. It makes me feel uncomfortable, she told the magazine, so she launched her own vegan clothing line with two of her friends called Hiraeth . Pascal Le Segretain - Getty Images

Kate Mara Rooney's sister Kate is also a proud vegan. "To me its so obvious: theres a life behind the eyes. Thats one of the reasons Im a vegan," Kate told The Georgia Straight in 2017. Getty Images

Mya The singer and her recipe-filled Instagram are all about that vegan lifestyle. She started off as a vegetarian and kicked things up with veganism, which she said was a real power challenge in a campaign for PETA . Since committing to the diet, she says its done wonders: shes no longer anemic, she rarely gets sick, and she lost 30 pounds. Plus, its helped open her eyes to the harsh treatment of animals. Steve Granitz - Getty Images

Rosario Dawson Womens Health cover star Roasario Dawson maintains a mostly plant-based vegan diet. Roasario didnt grow up vegan, and meat and dairy were key ingredients in her Cuban-Puerto Rican household, she told WH. Jennifer Graylock - Getty Images

Cory Booker Even Rosarios beau is vegan. Senator and former Democratic presidential candidate Cory Booker started his vegetarian journey in 1992 after reading Gandhis memoir, The Story of my Experiments with Truth. His path to veganism began then, but it was gradual. I think so many of our likes and dislikes are childhood memories or family traditions, and you associate the foods youre eating often with such good emotionsbut now, suddenly, eating those eggs for me was something that didnt align with my spirit, and I could feel it, Cory told VegNews . I finally just made a decision that I was going to become vegan. I remember my last non-vegan meal was Election Day, November 2014. Michael Kovac - Getty Images

Sadie Sink The Stranger Things star started the vegan life while being cast alongside fellow vegan Woody Harrelson in 2017 for The Glass Castle. The actress told Vegan Life Magazine that it was just the right thing to do: While I was with them [Woodys family] I was eating vegan and I was kind of like watching them and seeing the way they ate and the way they lived their lives. I was really inspired, so I decided to try it and I did some research, mainly by watching documentaries, and then I realized that it was the right thing to do. It was a really good decision that I made and Im very happy. Matthew Sperzel - Getty Images

Stella McCartney Stella McCartney grew up vegetarian and respecting animals, but the fashion designer told Numero magazine that she is moving toward veganism. For me, in fashion, I thought it would be hypocritical for me to use leather and fur if I dont eat it. If I dont believe in killing animals, why on earth would I do it for the sake of fashion, which would only make it even more ridiculous, Stella told the magazine . David M. Benett - Getty Images

Jenna Marbles Back in 2011, YouTube star Jenna Marbles dished the secret to her diet and exercise . Jenna maintains a vegan diet for all but one day a week, which she says is not because shes an animal freak. Instead, she found that she had a lot more energy and made her feel better. David Livingston - Getty Images

Ruby Rose Actress and model Ruby Rose started her gradual transition to a vegan diet in 2013 . By 2017, she was full-on vegan and even won PETAs Sexiest Vegan award that same year. Dave Hogan/MTV 2015 - Getty Images

Nathalie Emmanuel Game of Thrones actress Nathalie Emmanuel started a vegan diet with the help of her friend Mel Wells, she told Womens Health UK in 2018 . That coupled with my familys own medical history, weve had lots of conditions in the family, made me want to take control over what I put in my body, Nathalie said. So I ate vegan for one week at firstI would have reassessed if it made me feel really ill, but it made me feel really good, so I carried on for another week, and then I felt even better. People kept coming up to me and telling me I looked glowy and my eyes looked really bright, so I kept going. Jamie McCarthy - Getty Images

Daryl Hannah Actress Daryl Hannah started as a vegetarian, which led her to veganism. She is even a proponent that veganism can satisfy any craving. I grew up on junk food, and for me and millions of other Americans, it's comfort food, Daryl told Vegetarian Times . I wanted to say those cravings can be satisfied with real food, food that grows in the ground or from trees. Treats can be good for you when made with whole, organic fruits and vegetables! Slaven Vlasic - Getty Images

Olivia Wilde Booksmart director Olivia Wilde has been a vegetarian since age 12, but that didnt mean switching to vegan was easy. [Being vegan] is not always easy and accessible, but its a way of life and makes me as a person feel really good and physically look better," Olivia said . Kevin Winter - Getty Images

Robin Quivers Howard Stern Show co-host Robin Quivers started her vegan journey while in recovery from surgery to remove cancer. She attributes being healthy today to the vegan diet she implemented, according to the Los Angeles Times . That led her to write a cookbook and memoir titled The Vegucation of Robin. Paul Andrew Hawthorne - Getty Images

Lucy Watson Made in Chelsea star and Feed Me Vegan author Lucy Watson fills her plate with grains, nuts, tofu and, of course, veggies. You have to check out these Insta-worhty vegan meals she shared with Womens Health UK . If youre not vegan already, it will make you want to make the switch. Joe Maher - Getty Images

Demi Moore Demi Moore is one of the celebs following a raw vegan diet . Demi often speaks about vegan diets and how they shouldnt be used as a get skinny now method. Instead, she sees it as a way to get and stay healthy. Amy Sussman - Getty Images

Ava DuVernay Award-winning director Ava DuVernay is such a well-known vegan that she won an award for it. She and Benedict Cumberbatch were crowned the Most Beautiful Vegan Celebs of 2018 ! Araya Diaz - Getty Images

Fiona Apple Fiona Apple has been a long-time vegan. The singer has the same split-pea soup before every performance, according to Rolling Stone . A great choice. Stephen Shugerman - Getty Images

Laverne Cox Ruby Rose isnt the only Orange is the New Black star to go vegan. Laverne Cox celebrated her first World Vegan Day in 2017 when she was just 13 weeks into her journey. You go, Laverne! Jamie McCarthy - Getty Images

This article is part of Women's Health's 2020 Vegan Week click here for more. Hearst Owned