These kidney-shaped beans are also known as string beans and sometimes butter beans because of their cream-like texture. They are not only a nice, crunchy, low-calorie food that looks amazing on your plate, but also provide many key nutrients. These are a rich source of dietary fiber and hence maintain the health of your digestive tract. They are heart-healthy as they reduce cholesterol. Being rich in vitamin K, it ensures bone health. If you re looking for a vegetable with stellar amounts of antioxidants, french beans certainly fit the bill. It acts as a wonder food in pregnancy as it contains considerable amounts of folate and other B-vitamins.