Dietary health preservation is one of the contents of health preservation culture, that is, how to achieve the purpose of health preservation through reasonable and correct diet. For ancient rulers, it was to cure the sufferings of the people, while for ordinary people, it was to maintain their own bodies. Huangdi Neijing first explained its functions and requirements. Combined with other medical and nutrition books, it can be basically summarized as "nine fives": five grains are the supplement, five vegetables are the supplement, five animals are the benefit, and five fruits are the help; Five times are smooth, five parties are suitable, and five States are the basis; Five flavors harmonize and five tonics nourish.

The meaning is easy to understand, that is, staple food, meals and vegetarian dishes should be matched reasonably. The characteristics of five grains determine the function of health preservation, such as the richest nutrition, and carbohydrates provide the source of human heat, which means "man is iron and rice is steel"; The second one is easy to digest and absorb. Why is grain a staple food? Because it also has a great feature that other substances are easy to supplement the nutrition that cereals lack. For example, eating animal food to supplement fat, grains can provide sugar to help oxidation, thus generating heat.

Five-dish "stuffing" refers to sunflower, leek, epimedium and onion, which only means that all vegetables should be eaten reasonably. Vegetables are rich in vitamins and dietary fiber, and minerals can meet the basic nutrition needed by human body. In life, people who don't like vegetables for a long time will obviously feel that there are problems in some parts of their bodies, such as yellow hair, dark skin color or indigestion.

Five fruits, that is to say, eat more fruits to supplement nutrition and promote digestion. The following words say that diet and health care should pay attention to conform to the world, that is, what to eat at what time and season, and keep it suitable for the weather environment.

The so-called "five faces and five States" refers to the influence of region on human health, so there will be regional differences in diet, and some people will be acclimatized. Five states refer to five constitutions. Everyone's physical condition is different, and different constitutions should be maintained.

Five flavors are harmonious, sweet and sour, salty and bitter. Different tastes correspond to the connection of different organs of the body, such as acid, first go to the liver; Suffer first; Take the spleen first, etc. Too much taste stimulation is not good for your health.

Five tonics are different tonics, such as ascending tonics, clearing tonics, light tonics, flat tonics and warming tonics, which correspond to viscera, yin and yang and qi and blood respectively, and are widely used in traditional Chinese medicine.

Diet is the most reasonable and effective way, which is simple and easy to operate. Pay due attention to every meal break and form a habit for a long time, and naturally achieve the purpose of health preservation.