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Green Tea
Why it’s a cold/flu fighter: Green tea leaves contain antioxidants that can help to boost immune function. A recent study published in the Journal of the American College of Nutrition showed that subjects taking a special preparation of green tea as a capsule experienced 23% less bouts of colds and flu overall and 36% fewer sick days. Their immune systems also produced more cells that fought off illness-causing bacteria and viruses.
What does this mean for you? Sip on green tea any chance you get. However, keep in mind that green tea does contain caffeine—20 to 50 mg per 8 oz.-cup, depending on how long you steep the tea. (In comparison, a cup of coffee contains 100 to 120 mg per 8 oz.-cup.) For adults, a moderate amount of caffeine is 200 to 300 mg per day; more can be associated with side effects, which include restlessness and difficulty sleeping. For this reason, you should closely monitor how much green tea kids have. One cup per day for a gradeschooler or preschooler is fine (just don’t steep the green tea too long for young kids). Or just give them the decaf variety, especially if they’re drinking it when they have the cold or flu.
綠茶
綠茶含有抗氧化劑，可以幫助提高免疫功能。最近一項醫學研究表明：服用某種特制綠茶膠囊的受試者普通 感冒和流感的發病率降低23%，病程也縮短了36%。同時他們體內產生更多免疫細胞，可以更有效地對抗細菌和病毒。
對我們有什么啟發呢？盡可能喝點綠茶。不過需要注意的是，綠茶含有咖啡因。一杯綠茶中含有20-50mg咖啡因，當然泡的越久含量越高。相比之下，同樣的一杯咖啡中含有100-120mg咖啡因。成年人每天攝入200- 300mg咖啡因是比較適量的，再多就會引起激動、失眠等副作用。所以，對喝茶的孩子應該特別關注。學齡前兒童或小學生每天喝一杯綠茶有益無害。或者在他們感冒的時候，給他們一杯低咖啡因的綠茶也是個好主意
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