String beans, also known as green beans, are fiber-rich vegetables that are low in calories and have minimal fat. These vegetables provide carbohydrates and protein. Whether fresh, frozen or canned, the nutritional content is similar.
Calories
Each cup of string beans contains 34 calories. Because of the low calorie count, string beans may be appropriate for dieting. You could burn off more than four cups of green beans by walking for one hour at a 2-mph pace.
Fat
Like most vegetables, string beans are naturally low in fat. A cup of string beans contains about 0.1 g of fat. Because fat contains nine calories per gram, this means 1 cup of string bean contains less than one calorie from fat.
Carbohydrates
The main source of calories in string beans is carbohydrates -- this nutrient group provides 77 percent of the calories in the vegetable. Each cup contains about 8 g of carbohydrates, with nearly 4 g of fiber. Dietary fiber may help reduce your risk of diabetes and decrease your cholesterol levels.
Protein
Although most of the calories in string beans come from carbohydrates, they also contain protein. Each cup of string beans contains 2 g of protein.
Vitamins and Minerals
String beans contain a significant quantity of vitamin C. A 1-cup serving provides 30 percent of the recommended daily allowance as well as 4 percent of the recommendation for calcium and 6 percent of that for iron.
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