Because of their rich green color, we don’t always think about green beans as providing us with important amounts of colorful pigments like carotenoids. But they do! Recent studies have confirmed the presence of lutein, beta-carotene, violaxanthin, and neoxanthin in green beans. In some cases, the presence of these carotenoids in green beans is comparable to their presence in other carotenoid-rich vegetables like carrots and tomatoes. The only reason we don’t see these carotenoids is because of the concentrated chlorophyll content of green beans and the amazing shades of green that it provides.
Research comparing the overall antioxidant capacity of green beans to other foods in the pea and bean families (for example, snow peas or winged beans) has found green beans to come out on top, even though green beans are not always highest in their concentration of specific antioxidant nutrients like phenolic acids or vitamin C.