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.
Beans are a good source of iron, protein and fiber. Photo Credit Hemera Technologies/AbleStock.com/Getty Images. Iron, an essential mineral, exists naturally in animal products and some plant foods, including beans and other legumes.ron Content. A 1-cup serving of boiled black or pinto beans provides 3.6 mg of iron. A 1 cup serving of boiled navy or lima beans provides 4.5 mg of iron, and a 1 cup serving of boiled kidney beans provides 5.2 mg of iron.