Turnips contain abundant amounts of carbohydrates. One cup serving of raw turnips provides around 8.5 grams of carbohydrates. This comprises of approximately 5 grams of sugar and 1.2 grams of starch. Sugar and starch provide your body with the energy needed for day to day functioning. Turnips have a low protein and fat content with one cup of turnip providing approximately 1 gram of protein and 0.1 gram of fat.