Your immune system is mind-bogglingly clever. It's able to distinguish your normal healthy cells from nasty bugs, germs and viruses and then attack those bad guys, ensnare them and remove them from your body.
Amazingly, your white blood cells can remember a baddie and rapidly respond to a re-occurrence, protecting your body in record time.
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(NB: This is not an accurate biology lesson. It is our way of making something exceptionally complicated more fun. We would have used celebrity names to represent cells if it was appropriate.)
It takes more than an apple-a-day to keep the doctor away, so here are eight superfoods that can keep your immune system on guard...
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