"Yellow Wax" is a given name to dozens of wax bush bean varieties that individually simply happen to have different shades of yellow in appearance and variance in waxiness depending on the cultivar. Yellow Wax beans are nearly identical to Green beans in all aspects except for color.
Low in sodium, practically fat-free and cholesterol-free, yellow wax beans provide a good source of vitamin C, iron and immunity-boosting folate. One-half cup cooked beans contains about 22 calories. Eating five daily servings of vegetables and fruits lowers the chances of cancer.