Entertainment

Sydney Sweeney Reveals Diet Secrets for 35-Pound Weight Gain

Sydney Sweeney Reveals Diet Secrets for 35-Pound Weight Gain
Editorial
  • PublishedOctober 30, 2025

Sydney Sweeney recently disclosed her rigorous diet plan that helped her gain 35 pounds for her upcoming role in the biopic about boxer Christy Martin. During an interview on Sirius XM on October 29, 2023, Sweeney described the transformation as a significant undertaking, both physically and emotionally.

“It was a huge undertaking,” she said, reflecting on the emotional depth of Martin’s life, which includes extensive growth and challenges. Sweeney noted that she had “about two and a half months to train” for the role, which required her to increase her weight significantly. “It was a lot of prep,” she added, acknowledging her intense eating regimen.

Sweeney humorously revealed that her nickname on set was “my smuckers” due to her fondness for eating Uncrustables, a popular snack. She admitted to consuming “so many protein shakes,” although she found them less than enjoyable, stating, “I would just plug my nose and down them. Ugh, it was a lot.” In addition to these snacks, she confirmed her consumption of substantial quantities of egg whites and chicken as part of her diet.

Transforming for Christy Martin’s Story

The actress emphasized the importance of accurately portraying Martin, who is now 57 years old. Sweeney expressed that telling Christy’s story was vital, declaring, “She is inspiring and an ultimate underdog.” Sweeney highlighted Martin’s influence on women’s sports and boxing, noting, “She completely changed the way that women in sports and boxing have gone on in time past her.”

Working closely with Martin during the preparation was a unique opportunity for Sweeney. “I always felt like I could turn to her for everything,” she said, praising Martin’s guidance in learning boxing techniques. “She would yell at me different swings I needed to do,” she added, showcasing the close mentorship relationship they developed.

Sweeney previously discussed her physical transformation in a September interview with Vanity Fair, stating that she felt “very strong and powerful.” Her journey involved revisiting her past training in jiu jitsu, grappling, and kickboxing, but also required learning proper boxing stances and techniques specific to the sport. “You square up differently, and, of course, you don’t get brought to the ground — everything’s on your feet,” she explained.

Feeling Empowered and Proud

The actress described her body transformation as a departure from her usual appearance, noting that she had to adjust her wardrobe significantly. “I didn’t fit in any of my clothes,” she shared, mentioning how her jeans size changed from 23 to 27. “My boobs got bigger. And my butt got huge. It was crazy! I was like, ‘Oh, my God,’” she recalled with a sense of pride.

Sweeney concluded her reflections by expressing her satisfaction with the entire experience, stating, “I was so strong, like, crazy strong.” The film, Christy, is set to premiere in theaters on November 7, 2023, and promises to bring Martin’s inspiring story to a broader audience.

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