American talk show host, Oprah Winfrey lost 40 pounds and stunned everyone with the incredible weight loss. The 69-year-old wowed all with a slimmed physique and as revealed from her diet it is not far from being attainable. She consumes 1,700 calories daily. Her diet comprises 20 percent protein, 30 percent fat, and 50 percent carbohydrates. Here are a few diet secrets of Oprah that help her stay...