1, scientific use of air conditioners Due to the large temperature difference between indoor and outdoor and poor indoor ventilation, it is often easy to catch a cold and cause a fever. Don't covet temporary comfort and neglect your health. The hotter the weather, the more you should strengthen heat-resistant exercise and reduce the time in air-conditioned rooms. Citizens who often work in an air-conditioned environment should try not to use air conditioners after returning home. 2, a reasonable diet should be light, to avoid greasy spicy and cold; Eat more fresh fruits and vegetables to keep the stool unobstructed; Mung bean porridge, lotus porridge, lotus leaf porridge and jujube porridge are often cooked at home to prevent heatstroke and cool down; Drinking more water and eating more high-salt food will lead to decreased saliva secretion; Eating too much high-sugar food will consume water and vitamins in the body, often causing dry mouth and low immune function; Smoking and drinking will lead to a decline in the defense function of the respiratory tract, which is easy to be infected with respiratory diseases. Therefore, it is necessary to reasonably match the diet, eat less fried and pickled food, quit smoking and limit alcohol. As a food to prevent colds, animal liver should be the first choice. Because the liver contains a variety of vitamins, especially a lot of vitamin A and more vitamin B 12, these vitamins can enhance the body's resistance.