The formula of health preservation in winter: eat sanduo+prevent four diseases+protect five diets: master the principle of "sanduo" and eat more white food to reduce fire. After beginning of winter, heating began in most parts of the north. The dry indoor air made people "angry" and they could eat more white food. You can choose white radish, cabbage, wax gourd, lily, tremella, lotus root and so on. Among them, Chinese cabbage and radish are the most effective and economical supplements, but people with cold stomach should eat less in winter. Eat more beef and mutton to keep out the cold. Eating beef and mutton can keep out the cold. People who are afraid of cold can also eat more root vegetables rich in inorganic salts such as carrots and taro, as well as iodine-containing foods such as kelp, laver and spinach. Eat more protein to improve immunity. Prevention: Cardiovascular and cerebrovascular diseases are most likely to occur in four diseases: in winter, the number of patients with myocardial infarction, angina pectoris, stroke and myocardial infarction increases, and cold stimulation makes people's sympathetic nerves extremely excited, leading to enhanced myocardial contractility, leading to unstable blood pressure and acute complications. Respiratory diseases such as asthma and chronic bronchitis: the elderly, smokers, patients with chronic diseases and people with low immunity are prone to chronic bronchitis in winter, which can lead to emphysema or pulmonary heart disease in severe cases, and cold stimulation can also easily induce asthma. Influenza: the biggest harm of influenza is to cause complications and aggravate potential diseases and falls: it is easy to fall and fall in snowy days, so protect the five parts-neck, shoulders, waist, knees and feet. Cold weather will bring trouble to these five fragile parts, causing pain in cervical spine, back and knee joint. Feet are farthest from the heart and have the worst blood supply, so they are more likely to catch cold and cause colds.