Sydney Sweeney recently revealed her disciplined approach to shedding the weight she gained for her role in the upcoming film, Christy.

In an interview with People published on December 10, the 28-year-old actress discussed the stringent diet she followed after completing the film. “I had to be really strict with myself,” Sweeney explained, reflecting on the challenging process of weight gain necessary for her role as a boxer. “It was really hard to put on all the weight during training.”

For her portrayal of boxing legend Christy Martin, Sweeney had previously put on 30 pounds.

“I was consuming an enormous amount of food—pretty much anything you could think of,” she said. “I was also drinking protein shakes non-stop and using a lot of creatine, which caused bloating.”

During an appearance on Sirius XM on October 29, Sweeney detailed her effort to gain 35 pounds for the biopic. “It was a major undertaking,” she shared, emphasizing the emotional depth required to capture the full arc of Christy Martin’s life. “There’s so much growth, pain, and understanding involved.”

After wrapping up Christy, Sweeney had seven weeks before production began on her next movie, The Housemaid, premiering on December 19. Sweeney also returned to film her hit TV series Euphoria, which began production for season 3 earlier this year.

To get back to her natural shape, Sweeney “stopped” all of her previous training methods.

“When you stop working out and taking all your protein shakes, you lose muscle super fast,” she explained. “It’s the first thing to go before fat. So, that I dropped within two weeks.”

On top of quitting her training routine, Sweeney also followed a “super clean” diet and performed “a lot of cardio.” The Anyone But You star credited her quick weight loss to her metabolism, which she explained “works really well.

Sydney Sweeney continues to receive rave reviews for her performance in Christy, and despite criticism of the movie’s opening weekend box office, sources exclusively tell Us Weekly the film has already recouped its costs. Over the weekend, Christy, which features Sweeney playing the role of former professional boxer Christy Martin, opened in 2,000 theaters and […]

“I don’t want to say this is super easy,” she said about her rapid weight loss. “But I’ve been a very active person my entire life. Like, I was a super active kid, and I’ve always kind of just stayed active and always had a good metabolism. I can gain weight, but I can lose it too.”

While Sweeney admitted she can morph her body for a role, “this might be the one and only” time she agrees to put herself through such a drastic physical change..

Earlier this year, Sweeney opened up about her transformation process for Christy a biopic that follows the life of Martin, who overcame an abusive ex-husband while becoming America’s best-known female boxer. The Euphoria star revealed in June that her body was “completely different” after training for “three and a half months.”

“I didn’t fit in any of my clothes,” she told W magazine at the time. “I’m usually a size 23 in jeans, and I was wearing a size 27. My boobs got bigger. And my butt got huge. It was crazy!”

Sydney Sweeney loved transforming her body for her upcoming Christy Martin biopic. “I felt very strong and powerful,” Sweeney, 27, told Vanity Fair in an interview published on Thursday, September 4. “I loved it. Being able to lose myself to become a vessel for somebody else is my dream.” The actress gained between 30 and […]

Sweeney continued, “But it was amazing: I was so strong, like crazy strong.”

During her training period, Sweeney shared that she was inspired by Martin’s strength and tenacity.

“Christy’s story is beyond important to tell. She is inspiring and an ultimate underdog. She completely changed the way that women in sports and boxing have gone on in time past her,” Sweeney said in an October interview with SiriusXM. “I knew that every single detail that was going to go into this, every choice that I made, was going to be an important one. Having Christy by my side during it was the biggest gift I could have asked for.”

Christy is in theaters now.