Sweet potatoes are the edible tubers of the sweet potato plants, known botanically as Ipomoea batatas. They resemble true potatoes, although these two plants are not closely related. Sweet potatoes most often have deep orange flesh, but it can also be purple among other colors. Purple sweet potatoes are much higher in vitamin A than other varieties of sweet potatoes.
Calories
The nutritional content of purple sweet potatoes can vary according to the specific variety. This information specifically applies to Belle Eden purple sweet potatoes with no other ingredients. The serving size is one cup. Purple sweet potatoes contain 114 calories per serving, according to My Fitness Pal. This provides about 6 percent of the daily value for calories, assuming a diet of 2,000 calories per day. A serving of purple sweet potatoes has 106 calories from carbohydrates and 8 calories from protein.
Carbohydrates
A serving of purple sweet potatoes has a total of 27 g of carbohydrates. This includes 17 g of starch, 6 g of sugar and 4 g of dietary fiber. The carbohydrate content in a serving of purple sweet potatoes provides about 9 percent of the daily value for carbohydrates and 16 percent of the daily value for fiber.
Protein and Fat
Purple sweet potatoes contain 2 g of protein per serving, or about 4 percent of the daily value for protein. They do not contain fat or cholesterol of any type.
Vitamins
A serving of purple, sweet potatoes provides 3.77 times the daily value of vitamin A. It also has 5 percent of the daily value for vitamin C.
Minerals
Purple sweet potatoes have 73 mg of sodium per serving, or about 3 percent of the daily value for sodium. They also have 5 percent of the daily value for iron and 4 percent of the daily value for calcium. Purple sweet potatoes contain no potassium.
Source: http://www.livestrong.com/article/286212-purple-sweet-potato-nutrition/
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