Actors who have the ability to transform themselves into their characters are exceptionally talented, but sometimes it can go a little too far.
The 33-year-old actor lost 15kg off his lean frame for 'Nightcrawlers', only to turn around for his next movie and have to stack on 7kg of pure muscle to play a hardcore boxer in 'Southpaw'. Jake definitely nailed it.
Marky Mark transformed himself (pun intended) for 'The Gambler' with a "medically supervised liquid diet," losing a whopping 27 kilograms for the role. Bye bye Marky Mark, hello Skinny Mark.
Once upon a time Chris Hemworth was a skinny-ish boy from the bay on 'Home and Away.' Nowadays he's a beefcake who basically 'overdoses on protein, veggies and brown rice' to keep him in shape for playing Asgardian Thor in the Marvel films of the same name.
Seven/Paramount Pictures Australia
Jake Gyllenhaal may have previously bulked up for 'The Prince of Persia,' but this time he's headed in the opposite direction, losing about 10 kilograms of body weight to play a struggling freelance crime reporter in 'The Nightcrawlers.' Bring back the beef cake please Jake!
Chris Pratt is known for playing the slightly more rotund character of Andy on TV show 'Parks and Recreation'. So when the call goes out to save the world Marvel Style, and join the 'Guardians of the Galaxy' cast line-up as Star-Lord, he did what most actors do and hit the gym. He also ditched the beer for six months as well. The results speak for themselves, really.
Getty Images/Chris Pratt/Instagram
When Henry Cavill signed on to play Superman in "Man of Steel," he wanted to make sure his 'abs weren't drawn on'. No CGI and definitely 'no shading'. The star put on 9 kilograms of muscle (and a whoooooooole lot of definition) to step into the skin tight, super-revealing Superman costume once made famous by Christopher Reeve.
Who: Matthew McConaughey
The go-to blonde and buff leading man in Hollywood has shocked onlookers of late with his gaunt appearance and emaciated frame. McConaughey is on a mission to lose 30 pounds (14 kilos) for his upcoming movie, "The Dallas Buyers Club" where he plays an AIDS victim turned drug dealer. Guess he's on the right track, he's nothing but skin and bones at the moment!
Getty Images/ Film Magic
He's known on the Hollywood circuit for his workout ethic, but taking on the role of Bane in 'The Dark Knight Rises' was one of the biggest physical transformations the British actor has undergone. While he looked huge on the screen, the 5ft 9" actor maxed the scales at 86 kilograms for the role. Speaking to the November issue of GQ, he said: "I'm not a big guy anyway. I'm only, what, 150 pounds [68 kilograms]? I was 190 [86 kilograms] for Batman, 179 [81 kilograms] for Warrior. Films make you look big." Well, the big screen might lie a little by the sounds of it, but there's no denying his Bane was huge.
Getty Images/Roadshow Films
Who: Ryan Gosling
Even hunky heart-throb Ryan Gosling has beefed up in the past. The 'Crazy, Stupid, Love' actor bulked up for his role in 'The Lovely Bones,' but director Peter Jackson didn't like the look and dumped Gosling from the movie. Ouch!
Who: Jared Leto
30 Seconds to Mars singer Jared Leto put on a whopping 30kg to play John Lennon’s killer Mark Chapman, in the movie 'Chapter 27.' Leto put the weight on over the course of six months, and took it off again just as quickly, giving himself a series of health issues. He had to spend time on set in a wheelchair because of problems with his feet and believes he experiences gout. Leto has said he'll never put his body through something like that again.
Who: 50 Cent
We were shocked when we saw these images of 50 Cent. The rapper and recording artist lost a staggering 22kgs to play a football player with Cancer in the film 'Things Fall Apart,' and likened the experience to ‘being shot.’ We are not surprised! The star dropped the weight by running three hours a day and existing on a liquid diet for nine weeks. Sounds like a nightmare!
Who: Christian Bale
Christian Bale is known for his dramatic transformations, but he took getting into character a step too far when he lost 30kgs in just four months to play Dicky Eklund in ‘The Fighter,’ and more than that for his role in 'The Machinist.' Although we admire his dedication to his craft, we think actors should be warned against going to these extremes, as they can get out of hand very quickly.
Who: Matt Damon
Matt Damon looked virtually unrecognisable after gaining over 30 pounds for his role in Steven Soderbergh's dark comedy 'The Informant.' Damon donned a nose appendage, cheek plumpers and a comb-over for the role, and found that putting on weight was a piece of cake. "At my age, all I had to do to gain weight was eat the way I did when I was in college and the weight went on instantly."
Who: Jerry Ferrera
Star of 'Entourage' Jerry Ferrera – aka Turtle – never expected his healthy diet and exercise plan to help him shed almost 30kgs, but it did and the results are staggering. Luckily, Ferrera's character evolved at the same time he did, so he wasn't forced to put the weight back on.
Who: Jack Osbourne
Jack Osbourne was used to more of a rock-star lifestyle than that of a gym junkie until he turned his life around thanks to a TV program called 'Adrenalin Junkie.' The program focused on Jack training for sports like rock climbing, mountaineering and trekking, all of which helped him to lose over 25kgs.
Who: Jonah Hill
Jonah Hill may have been typecast before, but the star no longer has to rely on 'the funny fat guy' roles to bring in the bread and butter. The 28 year-old star of 'Moneyball' shed 20kgs over the course of a year, and isn't looking back.
Who: Gerard Butler
42-year-old actor Gerard Butler knows how to master his body after bulking up to play King Leonidas in ‘300.’ But after the intense film shoot his abs soon turned to flabs and Gerry turned to yoga to help him shed the weight.
Who: Ricky Gervais
Ricky Gervais was once a much larger man than he is now, but it wasn't his fear of being on the receiving end of Hollywood's criticism (for once) that made him ditch the spare care tire, it was a fear of dying from heart disease or another obesity related illness.
Who: Seth Rogen
Funnyman Seth Rogan lost his weight for a part in 'Green Hornet,' but said he doesn't know if he likes it. We love him love handles and all.
Watch the trailer for 'The Green Hornet' next
Who: Gary Barlow
Gary Barlow says he's full of confidence now that he's lost weight since his Take That days.