Keeping moderate hunger can make people clear-headed, energetic and work efficiently, and it can improve human immunity, which is good for human health. Keeping moderate hunger can enhance the activity of human macrophages and reduce the occurrence of diseases such as colds, but excessive hunger also tends to make people malnourished, reduce the number of macrophages and lower immunity. Eating every day to ensure that eight is the best diet, not only conducive to health, reduce hypertension, hyperglycemia, cardiovascular disease, but also allows people to maintain a good body shape, not easy to gain weight, for people with obese body type is also conducive to weight loss. Eating too much every day, it is easy to make blood sugar rise, high blood pressure, easy to fatty liver, affecting human health.