"The day we had a kiss scene he didn't eat meat that morning because I'm vegan… and he eats meat like every half hour," Portman said of her on-screen love interest. "That's not something I'm angry about or care about but he was just being thoughtful."
Tessa quipped, "I didn't even know he could go without eating meat, he's just like eating bison in the morning."
In an interview with The Sunday Times, the "Black Swan" star opened up about her own killer body transformation she underwent to reprise her role as Jane Foster in the latest installment of the "Thor" franchise.
"It's pretty unusual and wonderful to be tasked with getting bigger as a woman," Portman said. The actress focused on strength training, a high protein vegan diet and various sauna sessions to help her pack on the muscle.
She also joked that she didn't see any more protein shakes in her future, "I don't think I'll ever have one again."
"Most of the body transformations we're asked to make are to be as small as possible and there's an emotional and sociological correlation to that," she said.
"For someone to say, 'Let's see how much strength you can have,' is a completely different psychological space to inhabit," Natalie continued. "I turned 40 while making the movie and it was an incredible point in my life to say, 'You're going to be the fittest, strongest version of yourself.'"