Listening to music - This simple, enjoyable habit can be a great way to lower the cortisol levels which in turn boosts the immune system.
Vitamin C - It is the most important nutrient for the immune system as it increases the production of cells that fight infections.
Working out - Regular exercise directly benefits your immune system especially when you're older.
Sleeping properly - 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.
Cold shower - Finishing off your shower with cold water helps your body resist colds and flu.
Wholemeal cereals - Swap processed cereals for wholemeal ones, as they'll help your body protect itself against external attacks.
'The Scream' - This highly famous 1893 painting by Edvard Munch has been stolen on two occasions, in 1994 and 2004. By 2006, it was recovered, and is back on display in Norway.
Nature - Spending time in nature and breathing fresh air helps your physical and mental health.
Garlic - When eaten raw, garlic's antimicrobial qualities are one of the best foods for boosting the immune system.
Vitamin A - Besides strenghtening the immune system, vitamin A also helps preserve your teeth, skin, and bone tissue. It also stimulates eyesight.