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Your immune system's main function is to protect your body against harmful organisms and substances, including viruses, which is why it's extremely important to keep certain daily habits that boost it.

Click here to see what you can do to strengthen your immune system.

▲This simple, enjoyable habit can be a great way to lower the cortisol levels which in turn boosts the immune system.

▲Selenium can be found in tuna, meat, wholemeal cereals, nuts, among others. The fiber in those ingredients also helps the body get rid of toxins with the help of the liver, boosting the immune system.

▲It is the most important nutrient for the immune system as it increases the production of cells that fight infections.

▲They both have anti-inflammatory properties.

▲Blueberries, raspberries and blackberries are some of the most antioxidant-rich foods and should be a part of your daily diet.

▲Regular exercise directly benefits your immune system especially when you're older.

▲Resting is vital for your body and mind. Try to sleep at least six to eight hours every night, as the immune system produces more cells during that period.

▲The 'Women's Health' website says that mushrooms have been scientifically linked to a boost in the immune system as they activate the cells that fight inflammations.

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Finishing off your shower with cold water helps your body resist colds and flu.

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In small quantities, this combo provides antioxidants that reduce inflammations.

▲They're rich in beta-carotene and can be found in foods like apricots, peaches, watermelon, corn, turnip, cabbage, potato, beet, broccoli and asparagus. These foods also contain antioxidants, which help repair cells damaged by free radicals.

▲Swap processed cereals for wholemeal ones, as they'll help your body protect itself against external attacks.

▲Zinc can be found in dairy products, nuts, seafood, red meat, beans and wholemeal grains. It is really important when it comes to improving the development of T cells, which are vital in identifying antigens and informing the immune system about the presence of harmful substances in our body.

▲Stress can alter your mood and cause depression and anxiety, which directly affect the immune system, raising the chances of developing illnesses.

▲A great way to reduce stress levels is to meditate daily.

▲Spending time in nature and breathing fresh air helps your physical and mental health.

▲Vitamin E also stimulates the production of cells that fight germs and bacteria and protect the body against environmental contaminants.

▲Salmon sushi is anti-inflammatory and rich in carotenoids.

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It's important to get vitamin D from the sun, but in excess it can cause skin aging and weaken the immune system.

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Besides strenghtening the immune system, vitamin A also helps preserve your teeth, skin, and bone tissue. It also stimulates eyesight.

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Alcohol contains metabolites called aldehydes, which harm the immune system and make the body more vulnerable to diseases.

▲Tobacco has a similar effect to alcohol as it also affects the immune system and increases the chance of developing breathing problems, such as pneumonia and bronchitis.

▲Many studies have linked laughter to a growth in antibodies.

▲Coconut is a great source of lauric acid, a type of fat that is converted into monolaurin, which has antibacterial, antiviral and antifungal properties.

▲When eaten raw, garlic's antimicrobial qualities are one of the best foods for boosting the immune system.

▲A study by US University Wilkes University analysed the intimate habits of 111 university students and found that the ones with the most active intimate lives had a higher level of immunoglobulin A in their saliva.

▲A study released by the Proceedings of the National Academy of Sciences showed that some substances found in tea can help achieve a quicker immune system response.

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It is also important to limit the amount of coffee consumed because the acidity in it makes it harder for the intestine to absorb nutrients.