【咖啡因】一日飲多少咖啡才算超標？咖啡因過量的8大警號
起身第一時間喝杯咖啡充電、午飯後來一杯解膩、開會再一杯提神，到底每天可以喝多少杯咖啡？心跳加速和手震是代表攝取過量咖啡因嗎？讓我們為你一一拆解咖啡因迷思。 咖啡因是什麼？ 咖啡因是一種嘌呤生物鹼。目前已知有 60 餘種植物含有咖啡因，如：咖啡豆、茶葉、可可豆、柯拉果（Kola nut，曾是可樂萃取原料之一）、馬黛葉、瓜拿納等。這些可食性天然原料或其萃取物被應用於飲料的製作，例如咖啡、茶、汽水及朱古力等。人類在攝取咖啡因後，肝臟會開始進行代謝。喝完一小時後，咖啡因的效用會發揮至最強。在四至六小時後，身體會消化一半咖啡因。正因為如此，早上喝完咖啡，下午便開始睡意來襲。 咖啡因會誘發心血管疾病？ 竹口咖啡因的確會促進血液循環，但如果你是慣性咖啡飲用者，適當的咖啡應不會引致心律不正。如有心臟問題，建議少喝咖啡，但適可而止地喝一杯還是可以的。 咖啡因除了提神，還有其他好處嗎？ 研究顯示日常咖啡飲用者比起完全不喝咖啡的人更少患上失智症。另外，咖啡飲用者比起不喝咖啡的人更少患上勃起障礙症，這可能與咖啡能促進血液循環有關。 每日可以攝取多少咖啡因？ 健康的成人每天可攝取300-400mg咖啡因，等於大概3-4杯240cc的現煮咖啡。青少年、孕婦、心臟疾病患者每天只可攝取100mg咖啡因，等於大概1杯240cc的現煮咖啡。詳情建議先向醫生查詢。那麼攝取咖啡因過量，身體會出現什麼樣的狀況呢？以下是攝取咖啡因過量的8大身體警號。 攝取過多咖啡因會有何症狀？ 焦慮焦躁 越喝越累 失眠 心悸、心跳砰砰跳 頭痛 胃痛 頻尿 腹瀉 為何有人對咖啡因敏感？ 雖說健康的成年人每天可以攝取300-400mg咖啡因，但有些人卻喝完一杯咖啡便受不了，出現手震和心跳等情況。原來這與我們的基因有密切關係。2007年美國臨床營養期刊的研究發現，ADORA2A基因帶有CC或CT型的人，對咖啡因較為敏感，不適宜攝取高量的咖啡因。反之帶有TT型的人，可以耐受咖啡因，所以咖啡因的攝取量比較高。 為何亞洲人比歐洲人更容易有咖啡不耐症？ 除了adenosine 2A受體以外，最重要的就是肝臟中代謝系統cytochrome P450，，CYP1A2基因在163位置的點突變（A…
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