Snap beans originated in southern Mexico, Guatemala, Honduras, and Costa Rica. By 1492, they had spread northward to what is now the southwestern United States and then spread eastward from Florida to Virginia. US farmers began breeding the bean around 1890 because of interest in bean varieties with stringless pods.
According to the USDA National Nutrient Database, one cup of fresh green beans (about 100 grams) contains 31 calories , 0 grams of fat, 7 grams of carbohydrate , 3 grams of fiber, 3 grams of sugar and 2 grams of protein.
Green beans are a rich source of vitamins A, C and K and also contain folate, thiamin, riboflavin, iron, magnesium and potassium.
A Bean is a Seed
A Field of Beans