In recent years, due to health needs, people gradually realize the importance of coarse grain to human body. Common people begin to know that with the better life, we also cannot eat fine grains all the time. Then since when did the price of coarse grains in the supermarket become more expensive than that of fine grains. According to nutrition experts, it is not enough to just know that coarse grains are good. We need to eat coarse grains according to different age groups.