2. The principle of summer heat diet: Some scholars in ancient China thought that "summer heat and dampness should be clear". Facts have proved that in summer, people like cold drinks and drink more water, which causes moisture to invade the human body, while external moisture enters the body, which makes the water wet and strengthen the spleen, which makes the spleen and stomach rise and fall, causing digestive dysfunction, stagnant water and loss of appetite. According to the viewpoint of TCM health preservation, dryness and dampness in summer do great harm to the spleen, while bitter food has the effect of purging dryness and should not be eaten more, so it is advisable to eat more sweet and cold or sweet and cold in daily diet. And in summer, you return to your heart, but your heart likes cold and wants to eat sour, so you should eat more sour in summer. For example, you can often eat some wheat products, such as plums, peaches, olives, pineapples, celery and so on. Traditional Chinese medicine pays attention to the unity of heaven and man and the complementarity of yin and yang. Therefore, in summer, people should eat more sour and sweet food and try not to eat spicy and warm food. Also avoid excessive raw food and cold drinks, which will lead to the damage of healthy qi in the human body, induce diseases and cause some damage to your body.