Jason Momoa "shovels" away food to keep him strong enough to play Aquaman.

The Hollywood actor says he doesn't go on a diet to keep in shape for his role as the half-Atlantean, half-human in the James Wan superhero franchise, instead he just eats "everything" he likes to fuel his "hard work".

He told E! News: "I don't do calories.

"I just eat."

Asked what he eats, he just replied: "Everything.

"Because you're burning so many calories, I just eat and consume. I'm constantly moving and work long days.

"I just shovel it in, and then work hard. Work hard, eat hard, play hard, just do it."

The 44-year-old star insists he needs to be big and strong to take the weight of the 40-pound costume he wears in the sequel 'Aquaman and the Lost Kingdom'.

He added: "I don't really do it for vanity.

"It's more so I don't get hurt. You've got to be prepared. You're putting on a suit that's going to weigh 40 pounds. You've got to be able to move. That kind of action just puts a lot of weight on your knees. So, you just do it so you don't get hurt."

Meanwhile, Jason is "extremely proud" of his writing credit for the flick.

The star helped pen the script for the concluding picture in the DC Extended Universe (DCEU) and is delighted to have helped craft the story for a character he adores.

Speaking at the CCXP convention in Sao Paulo, Brazil, Jason said: "It's pretty much all me, and I love it. I'm extremely proud of it.

"There's a lot of things you want to do and fulfil as an actor, and also for the fans, and for myself. When we finished the first one, I had a lot of ideas. And I started to put them down, just put down in my heart and my love for the character."

The 'Game of Thrones' actor also recalled the "nerve-wracking" experience of pitching his ideas to director James and bosses from both DC and Warner Bros.

Jason said: "I've never done that before. I pitched my own idea but I'm like, 'They can't fault me on this, because I love this character and I've played it for so long. Here's some ideas that I would like to do.'

"And they responded really well to it, and then James liked a lot of ideas, and then they took that and ran with it and took it another level."