Often, the best superfoods aren't the obscure ones that cost an arm and a leg. They are those good-for-you standbys already sitting in the produce aisle. And while they may not be trendy, they are always in style. Take broccoli: it's loaded with essential vitamins, fiber, protein, omega-3s, and potassium. Adding to this stunning nutritional profile is new research that shows eating broccoli three to five times per week can protect against certain cancers, especially of the liver. Moral of the story? Eat broccoli, and lots of it.