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Hilary Swank

"I started working out five hours a day — I had to eat 210 grams of protein a day," Swank said about her regimented diet and exercise program for "Million Dollar Baby." "I don't know if you guys are aware of intake of protein. … I had to eat 60 egg whites in a day and I couldn't. So every morning I would drink them. I had to eat every hour and a half. So in the night, I had to wake up and drink protein shakes. I put on 23 pounds of muscle."

Demi Moore

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photo: Snakkle

Apart from her shaved head, Demi Moore underwent a total body transformation for her role in "G.I. Jane." Her workouts would reportedly begin at 4 am. And though the intense plan was only for the movie, years later Moore admitted to having an "extreme obsession" with her body.

Renee Zellweger

In "Bridget Jones's Diary," Zellweger had to put on a few pounds for the role. Unfortunately, her weight gain got more attention than she hoped, which she ultimately attributed to the fact that she's a woman. “I put on a few pounds [for the latest film],” she said. “I also put on some breasts and a baby bump. Bridget is a perfectly normal weight and I’ve never understood why it matters so much. No male actor would get such scrutiny if he did the same thing for a role."

Michelle Pfeiffer

Add this to the list of unhealthy ways to lose weight: Michelle Pfeiffer lived on "tomato soup and cigarettes" to portray a cocaine addict in the 1983 movie "Scarface."

Fast forward to today, and people are still fixated on how much she actually weighed for the role. At a reunion panel at this year's Tribeca Film Festival, a man boldly asked Pfeiffer how much she weighed while filming. The actress responded to the weird question by saying, “I don’t know, but I was playing a cocaine addict so that was part of the physicality of the part, which you have to consider. The movie was only supposed to be, what? A three-month, four-month [shoot]? Of course, I tried to time it so that as the movie went on I became thinner and thinner and more emaciated.”

Emma Stone

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photo: Getty Images

Emma Stone's latest role in "Battle of the Sexes" forced her to bulk up to play legendary tennis star Billie Jean King. “She took it seriously,” her trainer said. “She wanted to do the story justice.” 

Eva Longoria

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photo: Splash

Longoria's eight-year stint on "Desperate Housewives" made her go through some weight fluctuations. In order to make it look like her character Gabrielle "let herself go," the actress gained a bit of weight and cut her hair.

Gwyneth Paltrow

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photo: Splash

Much to her dismay, Paltrow had to pack on some pounds for her 2010 film "Country Strong." As expected, the actor quickly dropped the weight soon after.

Julia Roberts

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photo: Splash

In "Eat Pray Love," Julia Roberts plays a woman who embarks on the adventure of a lifetime, which of course, includes plenty of eating in Italy. "By the time we left Rome I was seven to ten pounds heavier," Roberts happily said.

Brie Larson

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photo: Instagram/brielarson

Fifteen pounds of muscle was Larson's goal for her "Captain Marvel" transformation. Though it seemed grueling, the actress seemed thrilled with the process. “I was able to lift things that I never felt in my life I would be able to do,” she said. “Every other day, I worked with this incredible trainer, and she would have me lift extreme weights over my head. Just having that, being able to deadlift before I went to work every morning, gave me this mental change that I never had before.”

Lily Collins

Lily Collins starred in Netflix movie "To the Bone," where she portrayed a girl battling anorexia. The actress, an eating disorder survivor herself, was apprehensive about starring in the film. "It was kind of nerve-wracking. You're doing it for a part, but it's something so close to you," she explained. "There's a fine line between, are you going to fall back into it, are you not? But I was so aware of why I was doing it — for a greater purpose — and also I was more mature."

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