Green tea reduces the risk of Sore Throat. Green tea naturally helps to fight infections and researches say that one cup of it a day helps make your immune system strong. it also fights ear Infection. it prevents you from getting a cold or flu. Polyphenols and flavenoids help to boost your immune system and making your body fight against infections. Catechin found in it can obliterate bacteria which reasons food poisoning and eliminates the contaminants generated by those bacteria.