@KTzone » 日常 - 健康資訊 » 開心果能降低膽固醇


2010-9-24 21:29 brightblayde
開心果能降低膽固醇

研究人員表示,富含抗氧化物的開心果對心臟有好處。

      May 20, 2010 -- 開心果長久以來都是中東與地中海飲食的主要成分,最新研究顯示,它可以降低心血管疾病的風險,部份是因為能降低膽固醇含量。
  
  研究人員表示,開心果中含有抗氧化物,並富含硒與鐵等許多維生素、礦物質,另外還有健康的油脂。
  
  賓州州立大學營養科學系的Penny Kris-Etherton博士與同事們招募了10位男性與18位女性來吃這種堅果,所有的人都是健康的非吸菸者。他們發現,吃開心果會讓高膽固醇的成人增加抗氧化劑含量。
  
  營養學教授Kris-Etherton在新聞稿中表示,他們之前的研究顯示,開心果有降低油脂和脂蛋白的益處,這些都是心臟病的風險因素,這篇最新研究顯示開心果有其他的效果,因此,現在吃開心果有多重的健康益處。
  
  相較於其他堅果類來說,少量的開心果也富含抗氧化劑葉黃素、β-胡蘿蔔素、以及和γ-生育酚;β-胡蘿蔔素是維生素A的先驅,γ-生育酚是一種維生素E,葉黃素則是存在於深綠色葉菜中,對視力和皮膚健康很重要。
  
  【開心果的好處】
  研究人員表示,抗氧化劑是有益的,因為被氧化的低密度脂蛋白(LDL或是「壞」的膽固醇)與炎症以及血管中斑塊的累積有關。
  
  賓州州立大學發布的新聞稿指出,抗氧化劑應該防止LDL氧化,轉移到血管壁造成發炎反應。
  
  Kris-Etherton教授表示,目前針對抗氧化劑所做的研究並未顯示出明顯的好處,也許是他們太久沒有做人體的研究,也許是食物中有些成份會隨著抗氧化劑而移動,科學界對抗氧化劑的情況是非常失望的。
  
  現在是因為特定抗氧化劑的研究並未顯示出對健康有好處,不過,她表示,流行病學的研究似乎顯示出抗氧化劑有益。
  
  她和研究小組進行一項隨機控制的攝食試驗,將開心果加入健康的飲食中,測試吃開心果對抗氧化劑含量的影響。
  
  參與者開始時吃的飲食是總脂肪含量35%、飽和脂肪酸11%,共吃兩個星期,科學家認為是典型的美式飲食。後來,他們測試了三種飲食,每種飲食測試四週,中間大約間隔兩週。有一種飲食是沒有開心果,總脂肪25%、飽和脂肪酸8%,第二種飲食是有10%的熱量來自開心果,第三種飲食是有20%的熱量來自開心果。
  
  相較於沒有開心果的飲食來說,有開心果的飲食讓血液中產生較多β-胡蘿蔔素、葉黃素、以及γ-生育酚,富含開心果的飲食也讓被氧化的低密度脂蛋白膽固醇濃度較低。
  
  Kris-Etherton教授表示,結果顯示,對心臟健康的飲食包括有開心果幫助血清氧化LDL含量降低,一部分透過降低膽固醇,也讓開心果中抗氧化劑有其他額外的益處。

2010-10-20 08:43 0909What
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