In addition to being very low in saturated fat and cholesterol, turnips are a good source of vitamins B6 and C and also contain a lot of calcium and dietary fiber. A large portion of their calorie content comes from sugars, however.
Every cup of cooked, boiled or drained turnips contains about 34 calories. A cup of turnips also contains 25 grams of sodium, 5 grams of sugars and 1 gram of protein. Based on a 2,000 calorie diet, a cup of cubed turnips provides 5 percent of the recommended daily value of calcium, 2 percent of the recommended daily value of iron and 30 percent of the recommended daily value of vitamin C.
Turnips are an effective weight loss and general health food and are also a good source of phosphorus, potassium and manganese. Eating turnips with other foods that contain complementary amino acid profiles may make them a more complete protein source, and may improve the quality of some types of restricted diets.
Turnips contain small amounts of niacin, folate and pantothenic acid, while magnesium and zinc are present in trace amounts as well. A cup of turnips contains 146 grams of water and a total of 49.9 mg of omega-3 fatty acids.