Matt Damon says his latest project left him physically and mentally drained, calling the experience the most challenging of his career, as reported by Fox News.

The actor opened up about the making of Christopher Nolan’s upcoming epic, “The Odyssey,” during an interview on “Sunday Sitdown with Willi Geist,” admitting he was “pushed to the limit” throughout production.

After more than three decades in Hollywood and roughly 80 films, Damon said no other project had tested him in quite the same way.

Matt Damon Says The Odyssey Was the Hardest Movie He’s Ever Made

Willie Geist: After everything you’ve done in your career, I have to imagine The Odyssey was a unique experience.

Matt Damon: Absolutely. It was the hardest movie I’ve ever made because of how ambitious it was.… pic.twitter.com/EjEe4wYOz2

— Pie Rsquare (@PieRsqaure) July 13, 2026

Here's What They're Not Telling You About Your Retirement

Playing Odysseus, the legendary king of Ithaca, demanded an intensity he hadn’t experienced before.

This Could Be the Most Important Video Gun Owners Watch All Year

He recalled one of his first conversations with Nolan, where the director warned him about the difficulty of the shoot.

“He was like, ‘This movie’s gonna be hard.’ And I looked at him like, ‘I’ve made, I don’t know, 80 movies,’” Damon said.

“And he goes, ‘No. This movie’s gonna be really hard.’ He, to his credit, was not lying.”

According to Damon, the ambitious production required punishing levels of physical dedication.

“It was definitely the hardest movie I’ve ever done just because it was so ambitious, just because what he was trying to do,” he explained.

Matt Damon says The Odyssey is the biggest film of his career by far.

“If you see a thousand people in a battle, there are a thousand people there. There’s no CGI.” pic.twitter.com/t2u9ZAftDP

— Best Of Cinema (@R0npz) July 13, 2026

As a 55-year-old taking on such a physically demanding part, Damon said the preparation became “its own challenge.”

He described long training sessions and difficult shoots across harsh environments.

Filming took place across extreme locations, including beaches in Morocco, mountaintops, and ocean scenes shot in unpredictable conditions.

“There was a lot of physical discomfort. It felt more like an expedition than a movie,” he said.

“Everybody was pushed to kind of the limit of what they could do. But the beauty of it is you look around and everyone is going through it with you.”

Despite those tough conditions, Damon said Nolan’s leadership kept the crew motivated. “Directing is by far the hardest job on set,” he said.

“When you’re out there kind of in the middle of a storm, and you’re soaked, and you’re cold, and you’re like, ‘Man, I’m in discomfort right now,’ it is helpful to turn and see the person with the harder job … looking like a drowned rat, just as cold, just as wet, and never complaining.”

Physical transformation also became part of Damon’s commitment to the role.

He shared on the “New Heights” podcast with Travis and Jason Kelce that he lost a significant amount of weight for the character after being told he looked “pretty yoked up” in set photos.

“Yeah, I was in really good shape,” Damon said. “I lost a lot of weight.”

Nolan’s vision, he explained, required a very specific look. “He said he wanted me lean but strong,” Damon said.

He followed a strict training regimen and embraced major dietary changes to achieve that.

“I literally, just because of this other thing I did with my doctor, stopped eating gluten,” Damon shared.

“I used to walk around between 185 and 200 pounds. And I did that whole movie at 167 pounds.”

He noted that he hadn’t been that light since high school. “So it was a lot of training and a really strict diet,” he added.

His transformation also continued beyond production, becoming a lasting change in his routine.

Earlier this month, Damon spoke about the lifestyle overhaul on Amy Poehler’s “Good Hang” podcast. He said that giving up gluten permanently has been “life-changing.”

“It’s just a complete, complete lifestyle change,” he explained after Poehler joked about him “getting jacked in your 50s.”

He described the process as total commitment, saying there was no balancing act—just focus.

“Any other time I tried to do something like that, it was always like, ‘Well, my time, my workouts’… and this was like… just put your foot on the gas, and that’s it,” Damon recalled.

The dietary change, he said, unexpectedly transformed how he feels day to day. “We didn’t talk about it, and I didn’t realize the level to which it was affecting me,” he said.

“It’s completely changed my life these last couple years of not eating it.”

Damon admitted the change comes with sacrifices. “It’s a bummer. I’m a big fan of bread and beer, and pasta and pizza and all that stuff, but how I feel is just so much better,” he said.

Through the challenges, the travel, and the physical strain, Damon said the experience left a lasting mark.

Playing Odysseus, he suggested, demanded not only endurance but also a willingness to start over physically and mentally in his fifties—a test he seems proud to have endured.

The Real MOU: What Trump’s Iran Agreement Actually Says – Truth Thursday | EP 677

The opinions expressed by contributors and/or content partners are their own and do not necessarily reflect the views of LifeZette. Contact us for guidelines on submitting your own commentary.