Well, for starters, more and more celebs — including Vanessa Hudgens and Halle Berry — have recently praised its weight-loss results publicly. The classic KD is composed primarily of fat (80-90%), with the remainder filled in with protein (8%-15%) and, to a minimal degree, carbohydrates (2%-5%). The goal is to mimic the body's state during fasting without impairing its ability for growth.