Health is the first wealth in life. Health and longevity has been everyone's wish since ancient times, especially in today's rapid development of science and technology, continuous improvement of material living standards and continuous enrichment of spiritual civilization. However, modern people's health is facing four hidden worries: fast-paced life and heavy work pressure, which make 70% people in "sub-health"; Excessive hygiene, comfort and self-protection reduce the chance of exposure to pathogens and greatly reduce the resistance; Environmental pollution and ecological imbalance pose a great threat to human survival and reproduction; With convenient transportation and frequent communication, the chances of disease transmission are obviously increased, and new pathogens are constantly emerging. How should we prepare? In addition to exercise and psychological adjustment, it is more important to eat, as the ancients said: "The way to keep fit is not before meals." A reasonable diet can make people strong and live longer. Improper diet is one of the important causes of disease and premature aging. Our ancestors realized the importance of diet and health preservation as early as 2000 years ago. Sun Simiao, a famous doctor in Tang Dynasty, attached great importance to diet. He believes that eating can dispel evil and fix dirty, which is the easiest way to adopt the benefits of life. Wang Mengying, a famous doctor in Qing Dynasty, said that "there is no mystery about diet, but only to save it", which further revealed that the secret of keeping healthy and longevity lies in adjusting diet. Diet is the basic condition for human beings to maintain their lives. To make people live a healthy, happy, energetic and intelligent life, we should not only be satisfied with having a full stomach, but also consider the rational distribution of diet to ensure that the intake of various nutrients needed by the human body is sufficient and balanced and can be fully absorbed and utilized by the human body. Changes in nature also directly or indirectly affect the human body. China ancient health experts stressed that people's life rules must conform to the changes of the four seasons. The key to keeping healthy in the four seasons is to adapt to the changes of yin and yang. The five internal organs of human beings are completely connected with the changes of the four seasons. Spring gas passes through the liver, summer gas passes through the heart, autumn gas passes through the lungs, and winter gas passes through the kidney. Huangdi Neijing, a classic of traditional Chinese medicine, has already pointed out the methods of keeping in good health at four seasons, and these methods are also carried out according to the law of the growth and decline of Yin and Yang at four seasons.

Spring, from the day of beginning of spring to the day of long summer, includes six solar terms: beginning of spring, Rain, Sting, Equinox, Qingming and Grain Rain. Spring is the first of the four seasons and the beginning of Vientiane's renewal, just as Huangdi Neijing said: "Spring is March, which is called Chen. Heaven and earth are born and everything is glorious. " It means that when spring returns to the earth, the ice and snow melt, the yang in nature begins to rise, everything recovers, and everything in the world is thriving. "People correspond to the earth." At this time, the yang in the human body also conforms to nature and diverges outward. Therefore, spring health care must master the characteristics of qi rising and relaxing in spring, and pay attention to protecting the yang in the body to make it constantly abundant and gradually vigorous. Anything that hurts the yang spirit and hinders it should be avoided. This principle of health preservation should be specifically implemented in diet.

Summer is the day from the long summer to the beginning of autumn. It includes six solar terms: long summer, small full, awn seed, summer solstice, light summer and great summer. When describing the characteristics of summer solar terms, Huangdi Neijing wrote: "Summer March is a beautiful month, and everything is gorgeous." Summer is the season with the highest yang in a year, and the climate is hot and full of vitality. For people, this is a period of vigorous metabolism. The human body has both yang and yin, and the blood circulation is correspondingly vigorous and active on the body surface. In order to adapt to the hot climate, skin pores are opened to drain water and sweat is discharged. By sweating, regulate body temperature to adapt to the hot summer climate. Basic principles of summer health preservation: heatstroke prevention in midsummer; Preventing dampness in long summer; At the same time, we should pay attention to protecting the human body's yang, so as to prevent excessive greed and coldness due to summer vacation, which will hurt the human body's yang, that is, "nourishing the yang in spring and summer" as pointed out in Huangdi Neijing, that is to say, even in hot summer, we should still pay attention to protecting the human body's yang, foreign symptoms, and even sudden fainting and coma leading to death. From this point of view, heatstroke prevention in summer cannot be taken lightly.

Autumn begins at the beginning of autumn and ends at the beginning of winter, during which it passes through six solar terms, including summer heat, white dew, autumnal equinox, cold dew and first frost. The Mid-Autumn Festival is the dividing line of climate change. "Guanzi" pointed out: "Autumn begins in the shade, so everything is harvested." Yin Qi started here, which means autumn. Due to the gradual collection of Yang Qi, Yin Qi gradually grew up. Everything is a harvest, which means that everything is mature and it is time to harvest. Judging from the climate characteristics in autumn, it turns from hot to cold, that is, the transition stage of "Yang disappears and Yin grows". The physiological activities of human body change from "long summer" to "autumn harvest". Therefore, autumn health care cannot be separated from the principle of "nourishing", that is to say, autumn health care must take the maintenance of yin in the body as the primary task. The main purpose of autumn health preservation is to prevent the harm of dryness and evil to people, so as to maintain the yin in the body.

Winter begins in beginning of winter, and passes through light snow, heavy snow, winter solstice, slight cold and severe cold until the day before beginning of spring. In winter and March, plants wither and frozen insects lurk, which is the season when everything in nature hides essence, and the yang of the human body should also be hidden in it. Therefore, the basic principle of keeping in good health in winter is to conform to storing yang in the body, and to collect yin and protect yang as the foundation. Due to the closed storage of yang, the metabolic level of human body is relatively low, and it is necessary to rely on the "kidney" as the driving force of life to ensure that life activities can adapt to the changes in nature. Traditional Chinese medicine believes that the total source of human energy and heat lies in the kidney, which is often called "firepower". Strong firepower, reflecting strong renal function and strong vitality; On the contrary, the vitality is weak. In winter, if the kidney function is normal, it can adjust the body to adapt to the changes in severe winter, otherwise, it will cause metabolic disorders and diseases. The rise and fall of human yang often indicates the activity of physiological functions, but nothing threatens human yang more than cold evil. After the cold pathogen hurts the yang, the human body's yang is weak, and the physiological function in the body is inhibited, which will produce a cold image. Keeping in good health in winter is very important for tonifying kidney and preventing cold. So, what should be done specifically on the issue of diet?

Based on the theory of traditional Chinese medicine, this book discusses the climate characteristics of the four seasons and the characteristics of human body changes, focusing on the specific methods of diet health care in spring, summer, autumn and winter, so that readers can arrange their own diet reasonably according to the changes of seasons and their own physique and age, which is very scientific, practical and readable, and is a bright light for your health and longevity.