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    保護胃,如何科學飲茶?

    放大字體??縮小字體 發布日期:2017-02-15??來源:茶情報??瀏覽次數:18416 ??關注:加關注

    養胃還是傷胃在茶界是一個老生常談的話題,有些人說喝茶傷胃也有些人說喝茶養胃,喝茶到底是養胃還是傷胃呢?

     


     

    胃是一個堅實的袋狀物,位于肺部下方的上腹部。這個袋子的壁叫胃壁,由3層組織構成,內層是粘膜層,中間是肌層,外層是漿膜層。粘膜層有胃腺,負責分泌黏液、胃酸和胃蛋白酶。胃酸的酸性很強,當食團進入胃中時,胃酸開始大量分泌,可使胃中的pH值降到2以下。胃蛋白酶作用是消化分解蛋白質。黏液起到潤滑和隔離的作用,使粘膜免受胃酸的腐蝕和胃蛋白酶的消化作用。

     


     

    喝茶對胃的影響:

    首先,喝茶可以補充水分,人體水分充足了,粘膜分泌的黏液才會充足,粘膜上皮才能得到比較好的保護。

    第二,茶湯的PH值多在5.5-7之間,是弱酸性,相比胃酸的強酸性微不足道,不會刺激胃粘膜,也不會中和胃酸。

    第三,茶湯中有咖啡因,會對中樞神經系統有短暫的興奮作用,從而促進胃液的分泌和胃腸蠕動,幫助消化,所以人們說“喝茶消食”。但如果胃中沒有食物時,過多的胃酸勢必會刺激胃粘膜,產生燒灼或刺痛的不適感。所以,避免空腹飲茶,還是應該要注意的。

     


     

    紅茶暖胃≠養胃

    傳言“綠茶傷胃,紅茶養胃”,很多人都認為紅茶可以養胃,有些人甚至認為胃不好的人應該多喝紅茶,這樣的想法是錯誤的。

    有醫學專家表示,紅茶雖是暖性,但不能簡單地與養胃劃等號。茶葉中的茶多酚雖然具有極大用處,對于抗癌也有良好的功效,但茶多酚具有收斂性,對胃會產生刺激,尤其是空腹情況下刺激性更強。盡管紅茶是經過發酵烘制而成,相比較綠茶而言,其中的茶多酚在發酵過程中發生了氧化反應,含量減少,對胃的刺激性不如綠茶強罷了。

    因此,即便紅茶偏暖性,與脾胃喜暖的特點一致,也不是人人都適宜。胃不好的人喝紅茶同樣要警惕,尤其是過濃的紅茶飲下肚,大量的咖啡堿同樣對胃會產生刺激性。所以,紅茶暖胃有一定道理,但與養胃則是兩碼事。

     


     

    保護胃,如何科學飲茶?

    茶有寒涼之分,人的體質也有寒熱差別,喝茶究竟養胃還是傷胃,要因季節而異,更因人而異。如果你是熱性體質,體內火氣多,多喝綠茶卻可排火祛毒。那么如果你的胃偏寒,有胃病就少喝寒性的綠茶,多喝一些暖性茶,多喝紅茶、熟普。另外,胃病患者吃完飯千萬不要馬上喝茶或飲料,至少要過20分鐘才能喝茶或飲料。除此之外,在吃飯時候,不宜飲茶,會導致消化不良。

     


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