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Fresh green beans are very low in calories (31 caloriess per 100 g of raw bean pods) and contain no saturated fat. Nevertheless, these lean pod vegetables are a very good source of vitamins, minerals, and plant derived micronutrients.
The beans are very rich source of dietary fiber (9% per 100g RDA) which acts as a bulk laxative. Fiber helps to protect mucousa in the colon by decreasing its exposure time to toxic substances as well as by binding to cancer-causing chemicals in the gut. Adequate amount of fiber has also been shown to reduce blood cholesterol levels by decreasing reabsorption of cholesterol-binding bile acids in the colon.
Green beans contain excellent levels of vitamin A, and health promoting flavonoid poly phenolic antioxidants such as lutein, zea-xanthin and ß-carotene in good amounts. These compounds help act as protective scavengers against oxygen-derived free radicals and reactive oxygen species (ROS) that play a role in aging and various disease processes.