Green beans are not really “beans,” according to U.S. Dietary Guidelines. The primary difference is in protein content. A cup of green beans contains just 2 grams of protein, whereas a cup of black beans contains 15 grams of protein.Green beans are usually harvested before the bean in the pod has fully matured — that’s why they don’t have as much protein as black beans, kidney beans or other types of dry beans.
Consequently, when paired with rice in a meal, they won't combine to make a complete protein like other beans do.
Source: Martha Filipic, Ohio State University College of Food, Agricultural, and Environmental Sciences.
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Artwork: Green Beans
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