When buying black beans, beans should be complete, uniform in size and black in color. Because there is natural wax on the surface of black beans, it will gradually fall off with the storage time, so don't buy polished black beans. There are two kinds of black beans after peeling: Ren Huang's and green kernel's, Ren Huang's is small black beans, and green kernel's is big black beans. There are many black beans sold online now, all of which are white kernels, not real black beans.

Nutritional value of black beans

1. Black beans are typical high-protein and low-fat foods, containing 18 amino acids, especially 8 amino acids necessary for human body; It also contains 19 kinds of oleic acid, with 80% unsaturated fatty acid content and high absorption rate.

2. Black beans are rich in vitamin E, anthocyanins, isoflavones and other ingredients.

3. The contents of trace elements such as zinc, copper, magnesium, molybdenum, selenium and fluorine in black beans are very high, which are very important for delaying human aging and reducing blood viscosity.