Black and red beans are an excellent source of folate, fiber, manganese, magnesium, iron, phosphorus, and Vitamin B1 (thiamin). Black and red beans are also an excellent source of the trace mineral molybdenum, which is responsible for detoxifying sulfites (a type of preservative commonly added to prepared foods). Black and red beans are rich in antioxidants, equal to the antioxidant powers of fruits such as blueberries. Animal studies suggest that not only do black beans help protect against cancer, but a “clear reduction” in the number of precancerous cells were seen in those with these beans in their diet. Studies have also shown that black and red beans help prevent heart disease.