Vegetables, an important source of food are easy to find. Eating. Several types of green vegetables provide nutritional benefits that help to form the basis for a healthy body. They are not only a food source, but also have medicinal properties that protect and cure many diseases. Green vegetables are rich in substances that are beneficial to health, such as protien, fat, carbohydate, calcium, iron, phosphorus, vitamins, minerals and fibers. Substances in green vegetables also combat free radicals that cause rapid bodily deterioration and cancer.