Eating only polished rice and white flour is not in line with the principle of balanced diet in nutrition, but also eating coarse grains such as corn, buckwheat, sorghum and oats. Current research shows that coarse grains are beneficial to diabetes, and replacing part of flour and rice with coarse grains is helpful to control blood sugar of diabetic patients. Traditional Chinese medicine believes that "stomach qi is the foundation of the four seasons", "if there is stomach qi, you will live, and if there is no stomach qi, you will die", and food staple food is the main source of stomach qi, so food helps to maintain vigorous vitality.
The five grains are the nourishment, the five fruits are the help, the five livestock are the benefit, and the five vegetables are the supplement. -Huangdi Neijing
The importance of whole grains to human body has been recognized in Huangdi Neijing, an ancient Chinese medicine book, and it is considered that whole grains are the foundation of health preservation.