Several varieties of purple potatoes come from the countries of Bolivia and Peru in South America. The different types of these potatoes include the Purple Majesty, Purple Viking and Purple Peruvian.
These potatoes have a comparable nutritional value to Russet potatoes. However, purple potatoes include four times the amount of antioxidants. One antioxidant, called anthocyanin, helps strengthen the immune system, lower blood pressure and prevent heart disease. A half cup of purple potatoes includes about 70 calories and 15 grams of carbohydrates, 1 gram of fiber and protein and no fat. The medium-starchy texture of the purple potato offers many preparation options in the kitchen, including baking, boiling and mashing.