Jennifer Aniston, Gwyneth Paltrow, and Michelle Obama - they all swear by it, kale! While it led a shadowy existence here for a long time, it has experienced a rapid rise in popularity internationally in recent years. Many stars and celebrities rely on kale when they need to get back "in shape," as it contains significantly more nutrients than other vegetables. Today, it is also highly valued in culinary circles and has found its place on the menus of gourmet restaurants.