Beyoncé Admits: 'I Have Struggled Since a Young Age With Diets'

The singer opens up about how she maintains her killer body.

— -- Beyoncé is opening up how she stays in such great shape.

The singer sticks to a plant-based diet outlined by exercise physiologist Marco Borges in his new book "The 22-Day Revolution."

"I felt like my skin was really firm, a lot tighter than when I deprived myself of food," she said. "[And, I] got the weight off fast, and the weight stayed off."