Speaking with reporters from People Magazine, the actress said she didn’t know anything about nutrition at the time, and she already rail-thin. … Going on a strict cleanse before shooting Les Mis, the Academy Award-nominated actress lost 10 lbs. Anne lost a lot of weight during her time on the set of Les Miserables in 2012. When she was cast as a starving prostitute, Anne Hathaway decided on a drastic way to lose weight – a diet that can only be described as miserable. Then, living off of two thin squares of dried oatmeal paste per day, she lost … Anne Hathaway’s heart-wrenching rendition of Fantine in Les Misérables in 2012 may have earned her an Oscar win, but it was not without sacrifice on … For Hathaway, losing the weight for the role was a consuming experience: “I had to be obsessive about it—the idea was to look near death. How Did Anne Hathaway Lose All That Weight For Les Miserables? Why Is It Hard To Lose Weight Even With Calorie Deficit? Anne lost too much weight at once and found herself in bed, sick. The actress lost 10 pounds courtesy of a strict cleanse before filming began, and followed it up by losing another 15 pounds by eating just two thin squares of dried oatmeal paste a day.