Turnip greens are an incredibly nutrient dense vegetable. One cup cooked has only 29 calories and yet is extremly high in vitamins A, B6, C, E, and K, folate, fiber, calcium, copper, and manganese. A one cup serving will actually give you 20% of the recommended daily value of calcium, which is a bone-building nutrient that most people aren't getting enough of! (See more turnip greens nutrition facts on Self.com and read more about caclium from the Linus Pauling Institute.)