Like other vegetables, green beans are a good source of fiber, potassium, and folate, and are an excellent source of protein, iron, and zinc. They contain anti-oxidants similar to those found in green tea, also known as catechins, which can improve heart health and help prevent cancer and manage/prevent diabetes.  Long and thin, sitaw is normally cut into bite sized pieces before cooked. They are then added to some stews, stir-fries and soups. Sitaw is a good source of copper, vitamin B1, chromium, magnesium, calcium, potassium, phosphorus, choline, vitamin A.