Rye beans as legumes, is also known as “wudou”, black beans, but after peeled is the yellow color inside. Black beans contain high protein, low-calorie, and its protein content as high as 38 percent, equivalent to 2 times the content of meat, eggs 3 times, 12 times the milk; rich in 18 kinds of amino acids, also contains 19 kinds of fats, unsaturated acid content of 80%, absorption rate as high as 95%.