3. Take plenty of vitamin D. In winter there is no sun and days are shorter hence you levels of vitamin D are rather low. This may become one of the main reasons why you are having the flu. Include fatty fish in your menu or take vitamin D in pills as a supplement. There are more sources of vitamin D: eggs, milk and orange juice. There is no perfect substitute for the sun, but there are many products that you can eat to make the situation better.

4. Take care of people suffering from the flu, but remember to put on a pair of surgical gloves before you approach the sick person, serve them food, help them around, etc. Do not forget that washing your hands more often also helps you protect yourself from viruses. Clean the surfaces around and take better care of the place you are located in.