Like other beans and legumes, turtle beans strengthen the kidneys and adrenal glands and therefore promote physical growth and development. As does the protein in meat, bean protein builds body mass; but unlike meat, beans don't add cholesterol, saturated fat, or toxic nitrogen byproducts. A stick-to-the-ribs filling food, beans are more grounding than a salad. A bean's color indicates the organ it most benefits, and thus, the black beans' color indicate how it's double supportive to the kidneys. Beans reduce the levels of serum cholesterol and so offer some protection against heart disease. They are a superior carbohydrate for people with diabetes or blood sugar imbalances, since they are slowly digested and cause only a gradual rise in blood sugar levels. The phytochemical diosgenin, which appears to inhibit cancer cells from multiplying, is found in beans. Furthermore, black beans are a good source of Dietary Fiber, Protein, Thiamin, Magnesium, Phosphorus, Potassium, Copper and Manganese, and a very good source of Folate.