Black beans are an excellent source of cholesterol-lowering fiber, as are most other legumes. In addition to lowering cholesterol, black beans' high fiber content prevents blood sugar levels from rising too rapidly after a meal, making these beans an especially good choice for individuals with diabetes, insulin resistance or hypoglycemia. When combined with whole grains such as rice, black beans provide virtually fat-free high quality protein. You may already be familiar with beans' fiber and protein, but this is far from all black beans have to offer.

In a study that examined food intake patterns and risk of death from coronary heart disease, researchers followed more than 16,000 middle-aged men in the U.S., Finland, The Netherlands, Italy, former Yugoslavia, Greece and Japan for 25 years. Typical food patterns were: higher consumption of dairy products in Northern Europe; higher consumption of meat in the U.S.; higher consumption of vegetables, legumes, fish, and wine in Southern Europe; and higher consumption of cereals, soy products, and fish in China. When researchers analyzed this data in relation to the risk of death from heart disease, they found that higher consumption of legumes was associated with a whopping 82% reduction in risk!

Black Bean: A Fiber All Star

Check a chart of the fiber content in foods; you'll see legumes leading the pack. Black beans, like other beans, are rich in dietary fiber. For this reason, black beans and other beans are useful foods for people with irregular glucose metabolism, such as diabetics and those with hypoglycemia, because beans have a low glycemic index rating. This means that blood glucose (blood sugar) does not rise as high after eating beans as it does when compared to white bread. This beneficial effect is probably due to two factors: the presence of higher amounts of absorption-slowing protein in the beans, and their high soluble fiber content. Soluble fiber absorbs water in the stomach forming a gel that slows down the metabolism of the bean's carbohydrates. The presence of fiber is also the primary factor in the cholesterol-lowering power of beans. Fiber binds with the bile acids that are used to make cholesterol. Fiber isn't absorbed, so when it exits the body in the feces, it takes the bile acids with it. As a result, the body may end up with less cholesterol.

Black beans also contain insoluble fiber, which research studies have shown not only helps to increase stool bulk and prevent constipation, but also helps prevent digestive disorders like irritable bowel syndrome and diverticulosis.