Turnips are very low calorie root vegetables; carry just 28 calories per 100 g. Nonetheless, they are very good source of anti-oxidants, minerals, vitamins and dietary fiber.A turnip is a white-skinned root vegetable that has become globally popular both for human consumption and livestock feed. Scientifically known as Brassica rapa, turnips are commonly grown in temperate areas across the globe, and is cultivated for the nutritional value and taste of the root. Turnip greens are also consumed in some parts of the world as a cruciferous vegetable, and there is a slightly different nutrient profile between the leaves and the root. These leaves, however, are often bitter and must be boiled down to be palatable, much like mustard greens. Turnips have also been known as an important part of the human diet for the better part of two thousand years. Countries from Brazil, England and Japan to Iran, the United States and Norway all have their own culinary takes on turnips, and have made them a mainstay in their cultural meals for centuries.