1, the cold weather in winter is the high incidence season of influenza. So you can eat some food or medicine to prevent it. First, you can soak some lemons in a thermos every day. Because lemon is rich in vitamin C, vitamin C can improve human immunity and has antiviral effect.

2. If qi and blood are insufficient, you can soak some longan dates in a thermos cup. Longan jujube has the functions of invigorating qi and nourishing blood, supplementing iron and improving immunity. You can also drink ginger water every day, which can dispel wind and cold and prevent colds.