Compared with the white flour and rice we usually eat, coarse grains mainly include corn, millet, purple rice, sorghum, oats, buckwheat, wheat bran and various dried beans, such as soybeans, mung beans, red beans and mung beans.

Coarse grains are also rich in trace elements such as calcium, magnesium, selenium and various vitamins, which can promote metabolism, enhance physical fitness and delay aging. Selenium is also an anticancer substance, which can be combined with many carcinogens in the body and excreted through the digestive tract.