After beginning of autumn, it is still very hot during the day, but the weather is getting colder and the temperature difference between morning and evening is getting bigger. Everything in nature enters the stage of gradually closing the yang and gradually increasing the yin. Beginning of autumn is a turning point from Yang Sheng to Yin Sheng. The metabolism of yin and yang in human body naturally enters a long transition period of yang eliminating yin. In autumn and winter, the human body is full of yin and yang, and the body is full of yin, so it is necessary to keep up with the gasification trend of yin. After beginning of autumn, the yang declined and the yin rose, and nature began to change from growth to collection. According to the principle of keeping healthy in four seasons, nourish yin in autumn and winter. Traditional Chinese medicine believes that the lungs correspond to autumn, and autumn dryness hurts the lungs. Lung-qi deficiency reduces the body's tolerance to bad stimuli and is easy to get sick. Therefore, it is necessary to moisten dryness, nourish yin and moisten lungs. After beginning of autumn, lung function began to be in a vigorous period. According to the principle of harmonizing yin and yang and balancing the body, it is necessary to strengthen the aftercare of liver, heart, spleen and stomach, so that the lung qi should not be too biased and affect health. After beginning of autumn, we should eat more sour food and less spicy food, that is, the principle of reducing pungent and increasing sour, to help liver qi, and eat more foods that calm the liver and moisten the lungs, such as lily, lotus root, potato, radish, fungus, yam, lentil, medlar, tremella, pork, duck, chicken, rabbit, peanut, eel, crucian carp and yellow croaker. Autumn is a season suitable for tonic, but we should choose "dry but not greasy" products, such as pumpkin, lotus seeds, longan, black sesame, red dates, walnuts and so on. Eat less spicy products such as onions, ginger, garlic, leeks and peppers. Avoid eating more fruits and vegetables to avoid hurting the spleen and stomach.