The 33-year-old model, who is dating superstar George Clooney, said she lost weight unintentionally without any work out, reported Contactmusic.
"I actually took some time off from working out just to see how my body reacted to certain foods by eliminating them out of my diet. I did no gluten, no soy, no dairy, I did no sugar. I was eating protein and vegetables.
"I felt amazing. I really do believe you are what you eat. When I was on it, I actually lost weight and that was without working out. So that was part of the experiment I wanted to do, was to see how my body my reacted," she said.