Sweet potatoes are a type of dry and starchy edible tuber similar to potatoes. Like many edible tubers, sweet potatoes have a high carbohydrate content, between 22 and 42 grams per serving, depending on the type of sweet potato. In general, sweet potatoes have more carbohydrates per serving than red, white, russet or sweet potatoes.
Standard Nutrition Facts for Sweet Potato
According to the USDA Agricultural Research Service, a regular serving of sweet potato contains approximately 42 grams of carbohydrates. One serving is about a cup of sweet potatoes cut into cubes. This portion also possesses 6, 2 grams of dietary fiber, 177 calories and 2.3 grams of protein. Sweet potatoes have very little fat, less than half a gram per serving, as well as very little sugar, less than one gram per serving.
"Mountain Sweet Potato" Nutrition Facts
A type of Hawaiian sweet potato known as "mountain sweet potato" has fewer calories, carbohydrates, and fiber than standard sweet potatoes. One cup of these sweet potatoes contains 22 grams of carbohydrates, 91 calories and 3.4 grams of fiber. These sweet potatoes have similar amounts of sugar and fat as regular sweet potatoes, less than half per gram of each in a cup. "Mountain sweet potatoes" have about half the potassium and phosphorus content of regular sweet potatoes and less than half the potassium content.
Other edible tubers appear to have a low carbohydrate content compared to sweet potatoes. One cup of russet potatoes cut into cubes contains only 27 grams of carbohydrates and one cup of white potatoes contains 23.5 grams, about the same amount of carbohydrates that can be found in a serving of red potatoes. Sweet potatoes, which many people in the United States consider to be interchangeable with sweet potatoes, although they are different vegetables, also have few carbohydrates, approximately 27 grams per serving.
Diets where there is awareness of carbohydrates
Due to the high content of carbohydrates in sweet potatoes, people who make diets with low or no carbohydrates may want to avoid this vegetable. Sweet potatoes, russet potatoes, white and red potatoes are options with less carbohydrates. For those who are aware of carbohydrates who want to consume sweet potatoes, Hawaiian "mountain" sweet potatoes are an alternative. A serving of these Hawaiian sweet potatoes contains about 20 grams less carbohydrates in a serving than regular sweet potatoes.