How did Zoe Kravitz slim down for her role as an anorexic in the new film The Road Within? By downing dirt. "I ended up drinking clay," Kravitz says, "because it cleans out your body and fills you up." But that wasn't her only weight-loss trick. "I was eating like a Mason jar of pureed vegetables a day and running," she adds, noting that she would "never encourage anyone" to try either method for losing weight. "I was a space cadet," she says.