Green Tea boost my immune system. Green Tea is the most awesome tea, recently taken the world by storm. I drink 3 cups a day, which is the equivalent of eating 8 apples according to the daily mail. Tea can also rehydrate you so can be used as a substitute for water. I know this because my pee is mostly clear. I used to get the flu 4 times a year without failure. Even during the summer. I suffered for year. ie until I Started to drink Green Tea. My energy levels shot up. I only got sick once in the 2 years that I have been taking it. I think it was the airline food and the long thirsty journey that caused my Tonsillitis. I might have even died the Doctor told me if I didn't have a strong immune system. Well anyway. I haven't been sick drinking green tea.