There is a folk proverb: slight cold and great cold make ice hockey. Slight cold indicates the degree of cold. Literally, the great cold is more terrible than the slight cold, but in meteorological records, the slight cold is colder than the great cold, which can be said to be the coldest of the 24 solar terms in the whole year. There is often a saying of "Sanjiu cold", and this "Sanjiu" is just within the slight cold solar terms. It is called slight cold instead of great cold because solar terms originated in the Yellow River basin. The twenty-four solar terms say: "The cold at the beginning of the month is still small ... but it is big in half a month." According to the situation at that time, it only lasted until today. It is said that in the early years, every farmer in the Yellow River valley used the "Cold Map of 1999" to avoid the cold, and now all kinds of medicinal hot pots have become delicious dishes for the people of the whole country to dispel the cold and strengthen the heat. Because of this, many people ignore the problem of reasonable tonic, especially young people, rely on physical strength, overeating, hunger and cold, and eventually lead to endless future troubles. Sun Simiao, a famous doctor in the Tang Dynasty, pointed out: "Food is the foundation of peace of mind ... those who don't know how to eat correctly are not enough to survive ... so food can exorcise evil spirits and strengthen viscera", which shows the role of diet in the human body. Although the light snow solar term has been cold for several days, it is understandable that people make up for it, but it is essential to make up for it. We should understand the meaning of dietary taboos according to the principle of "different from person to person". The dietary instructions of the Yuan Dynasty emphasized: "Diet is for health, but I don't know whether the physical properties are suitable for each other. Even if they are mixed together, it will lead to internal discord and cause great disaster. " So I remind you not to be hurt by the "five flavors" when taking supplements. Young people should take supplements selectively according to their own conditions. Generally speaking, young people have a vigorous metabolism and need more protein and calories than the elderly, and calories mainly come from carbohydrates and fats. Carbohydrates mainly come from cereals, so young people should ensure adequate appetite, pay attention to the proportion of coarse grains in flour and rice and take in appropriate amount of fat, which are all considerations when choosing medicinal diet for tonic. But young people have the characteristics of young people. There are often people who eat fatty, sweet and spicy products and attract uninvited guests-"acne", whose scientific name is acne, which brings endless troubles to young people. Let's briefly talk to young friends about the causes and prevention of acne. Acne is a chronic inflammatory disease of sebaceous glands in hair follicles. Its etiology is related to endocrine dysfunction, and the activity of sebaceous glands is influenced by endocrine and mental factors. Because of the increase of androgen level and sebum secretion in adolescence, sebum deposition leads to the formation of hair follicle orifice embolism, and the increased sebum can not be eliminated in time, thus forming acne. In order to avoid pain, first of all, pay attention to personal hygiene, wash your face with warm water and take a bath frequently, eat less greasy, spicy and cold food, eat more fruits and vegetables, avoid constipation, and do not squeeze with your hands, otherwise the acne will subside and scars will remain. In treatment, TCM divides it into four types: wind-heat in lung meridian, damp-heat in spleen and stomach, disharmony between chong and ren, and heat and blood stasis. The prescriptions are [Pipa Qingfei Decoction], [Longdan Xiegan Decoction], [Jiawei Xiaoyao Powder] and [Siwu Decoction]. In short, if you have acne, you should seek medical treatment in time, and you must not handle it yourself. Speaking of tonic, there has been a saying since ancient times that "three nine make up one winter, and there will be no disease in the coming year". After nearly a year's consumption in spring, summer and autumn, the yin, yang, qi and blood of zang-fu organs will decline to some extent. Reasonable tonic can replenish qi, blood and body fluid in time, resist the attack of cold, and make young people suffer less from diseases in the future, thus achieving the goal of getting twice the result with half the effort. Tonifying in winter, combining food tonic with medicine tonic, and warming tonic is appropriate. Commonly used tonics include Ginseng, Astragalus, Colla Corii Asini, Cordyceps sinensis, Polygonum Multiflori Radix, Lycium barbarum and Angelica sinensis. Dietary supplement should choose mutton, dog meat, pork, chicken, duck, eel, soft-shelled turtle, Spanish mackerel, sea shrimp and other foods such as walnut kernel, jujube, longan, sesame, yam, lotus seed, lily and chestnut according to the ups and downs of yin and yang.