Scarlett Johansson changed her diet to perform as the Black Widow. The actress has revealed she followed a special regime to do the stunts in the movie Iron Man 2. “I had to change my diet — when you are working out like that you have to feed your new body so you eat in a different way. It’s very clean. I feel much stronger than I’ve ever felt just because I’ve had to build so much strength. I had no choice, I had to do it — I mean you want to do these stunts and you have to be strong in order to do them,” she told the press. Scarlett also commented how challenging her new role was. “I’d never been able to challenge myself in that way so that was exciting. Something new. And it used up aggression too.”