Green beans , regardless of the species cultivated , is a vegetable with a low in calories but rich in essential nutrients for health, protein , dietary fiber , calcium and iron . Just one cup of fresh green beans contains 200 milligrams of potassium , beta carotene and vitamin A.

Beta carotene reduces the risk of developing certain cancers and vitamin A stimulates maintain the accuracy of vision and bone growth . Green beans canned , no salt added , contains as many calories, dietary fiber and iron , as well as fresh green beans .