A double-blind study is one in which neither the participants nor the experimenters know who is receiving a particular treatment. This procedure is utilized to prevent bias in research results.
Total Dietary Fiber. Kidney beans contain more total dietary fiber per serving than the seven other most commonly consumed legumes in the United States, including black-eyed peas, chickpeas, lentils and black, navy, pinto and lima beans.
1 Beans are bursting with fiber. Pinto beans have 15.4 grams of fiber per cup, while black beans have 15 grams; try sprinkling all kinds of beans in soups, stews, and salads a few times a week, or enjoy bean and veggie-rich burritos.  Cooking can reduce a food's fiber, so enjoy lots of your veggies raw.