Black Beans DianaLegumes are what black beans fall under. Black beans, which are often referred to as turtle beans due to their hard, shell-like appearance, are the plant's edible seeds. They are regarded as nutritional powerhouses because of their abundance in fiber, plant-based protein, and antioxidants, all of which help control blood pressure, sugar levels, and cholesterol. Black beans, like the majority of legumes, contain antinutrients that may interfere with mineral absorption and digestion.