25 Actors Who Gained Or Lost Considerable Weight for Their Roles

Matthew McConaughey lost 40 pounds, and Jared Leto gained 60 pounds.

How difficult can acting be? Many of us have certainly fantasized about being a budding star who could easily portray a leading man or lady with a bit of luck and a little help learning the lines.

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However, as any actor will tell you, it's a career that takes a great deal of skill and dedication. It often goes beyond just sliding into character and delivering a few lines here and there while wearing makeup or a fake mustache.

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Would you be willing to put your body at risk in order to gain a lot of weight? Or to go on a month-long diet for a role-appropriate weight loss?

Or, in certain circumstances, to endure a torturous muscle-building regimen that necessitates six hours a day at the gym? After all, becoming a famous actor isn't easy at all.

We've decided to honor those notable celebrities who went to great lengths to modify their bodies, those who put in enormous physical and mental effort to represent their characters as truthfully and accurately as possible. Many of these actors deservedly received important accolades for their efforts.

Scroll down to see and learn about the tremendous transformations these celebrities endured in order to better represent their characters!

1. Mark Wahlberg

Wahlberg posted a photo of his earlier slim figure next to his new style, which he achieved by adding 20 pounds for his upcoming film, Stu.

1. Mark WahlbergIan Lawrence/GC Images; Instagram
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2. Joaquin Phoenix

The Oscar winner revealed his 52-pound weight reduction for his role in Joker.

"Once you reach the target weight, everything changes. Like, so much of what's difficult is waking up every day and being obsessed over like 0.3 pounds. Right? And you really develop a disorder."2. Joaquin PhoenixChristopher Polk/NBC; DC Comics/Warner Bros./Shutterstock
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3. Chris Pratt

He gained several pounds of muscle for his role in Guardians of the Galaxy.

3. Chris PrattNBC; Marvel

4. J.K. Simmons

When the star showcased his big biceps in Justice League, fans were astonished.

4. J.K. SimmonsGetty Images; Instagram

5. Jake Gyllenhaal

After losing 30 pounds for Nightcrawler, he said: "I'd say my mother was worried; I would say she just wanted me to be careful. But she also knew and knows how seriously I take what I do, and she respects that."

5. Jake GyllenhaalAndrew H. Walker/Getty Images; Bold Films/Kobal/Shutterstock

6. Miles Teller

The actor muscled up for his roles in Whiplash and the Divergent franchise.

6. Miles TellerJason Merritt/Getty Images for Giorgio Armani; Lionsgate

7. Michael B. Jordan

The Black Panther star gained roughly 30 pounds to play a boxer in the film Creed.

7. Michael B. JordanAndrew H. Walker/Getty Images; Barry Wetcher/Warner Bros/Mgm/Kobal/Shutterstock

8. Jared Leto

For his thrilling performance in The Dallas Buyers Club, the actor and musician won an Academy Award. For the role, he shed 40 pounds.

8. Jared LetoPascal Le Segretain/Getty Images; Anne Marie Fox/Voltage/Kobal/Shutterstock

9. Chris Messina

He added 40 pounds for his character in Live by Night.

9. Chris MessinaGary Gershoff/WireImage; Claire Folger/Warner Bros/Kobal/Shutterstock

10. Chris Hemsworth

The Thor actor lost weight for his role in In the Heart of the Sea. However, Hemsworth returned to his athletic form after filming.

10. Chris HemsworthINFphoto.com, Instagram

11. Renée Zellweger

The actress had to put on some weight to portray the likable character in the first and second movies of the Bridget Jones's Diary franchise.

11. Renée ZellwegerJim Smeal/WireImage, Jeff Kravitz/FilmMagic

12. Chad Michael Murray

For his role as a drug user in Other People's Children, the actor lost 25 pounds.

12. Chad Michael MurrayAP Photo/Lionel Cironneau; Gregg DeGuire/WireImage

13. Matthew McConaughey

The Magic Mike star lost 30 pounds for his role in The Dallas Buyers Club, based on a true story about a dying man with AIDS in the 1980s who cured himself with homeopathic remedies imported into the US from Mexico.

13. Matthew McConaugheyWarner Bros/Kobal/Shutterstock; Voltage Pictures/Kobal/Shutterstock

14. Matthew Fox

He spent five months working out with the same instructor who helped Daniel Craig prepare for his James Bond role.

14. Matthew FoxSummit Entertainment; ABC

15. Aaron Carter

In 2010, the artist shared a photo of his bulked-up body on Twitter with the caption:

"I've been at Johnny Wright's compound working on my mind, music, and body for a new album release!"

15. Aaron CarterKmazur/WireImage; Twitter

16. Taylor Lautner

After playing werewolf Jacob Black in the Twilight sequel, the young star transformed into a muscular heartthrob.

"The day I finished Twilight, I came home and started bulking up. For New Moon, I'm 30 pounds heavier than I was in Twilight."

16. Taylor LautnerBarry King/WireImage; SplashNews.com

17. Jason Segel

For his role in Sex Tape, the actor shed a significant amount of weight.

17. Jason SegelGetty Images; FameFlynet

18. Rooney Mara

The actress was thin and muscular for her lead character in The Girl With the Dragon Tattoo.

18. Rooney MaraJason LaVeris/FilmMagic; Ibl/Shutterstock

19. Anne Hathaway

The actress won an Oscar for her performance in the musical Les Misérables.

19. Anne HathawayPascal Le Segretain/Getty Images; Working Title Films/Kobal/Shutterstock

20. Christian Bale

The actor shed more than 60 pounds for his character in The Machinist in 2004. For both American Hustle and Vice, he gained 40 pounds, and for Ford v Ferrari, he dropped 70 pounds.

20. Christian BaleIsa Foltin/WireImage; Moviestore/Shutterstock

21. Jake Gyllenhaal

For his role in the 2010 film Prince of Persia, the actor resembled a god rather than a prince. To bulk up for the film, Gyllenhaal stated he practiced Parkour, a French technique of street running.

21. Jake GyllenhaalBei/Shutterstock; Disney/Kobal/Shutterstock

22. Tom Hanks

"All it is, is time and discipline." To play a guy left on an uninhabited island, he shed nearly 50 pounds.

22. Tom HanksFrancois Duhamel/20th Century Fox/Dreamworks/Kobal/Shutterstock

23. 50 Cent

The usually ripped rapper surprised everyone with a photo of himself looking skinny. To play a football player who has cancer in Things Fall Apart, he reportedly went from 214 to 160 pounds in just nine weeks.

23. 50 CentLawrence Lucier/FilmMagic; Twitter

24. Robert De Niro

The famous actor had to put on some muscle to play rapist Max Cady in the 1991 thriller Cape Fear.

24. Robert De NiroRon Galella Collection via Getty Images; Moviestore/Shutterstock

25. Christian Bale

Before his performance in the 2018 film Vice, he had to put on some weight to play Vice President Dick Cheney.

25. Christian BaleVivien Killilea/Getty Images; Matt Kennedy/Annapurna/Kobal/Shutterstock

It is amazing to see what some actors are willing to do to get into character. And that’s what makes them great actors.

Their job is to “sell” the character and make us believe they are real. It is evident that the people on our list are doing an excellent job.

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