What are the immune system booster food?

I am 26 years old and I will have to admit here that I have a very weak immune system. I do suffer frequently from one disease or the other. My doctor is now advising me to incorporate immune booster food in my diet. I don’t know much about such food item. So, I would appreciate if anyone can give me a list of immune system boosters!! Also tell me why such food are immune boosters?

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