Legumes are what black beans fall under. Black beans are really the plant's edible seeds, however they are often referred to as turtle beans due to their tough, shell-like texture. Impressive is the nutritional profile of black beans. Naturally vegan and gluten-free, black beans are rich in fiber and protein. A 2022 review published in Nutrients found that they are rich in vitamins, minerals, and antioxidants and have been associated with lower risk of illness.