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      維生素C能預防感冒嗎?
      2019-06-10 09:59 來源:人民網-健康時報

        原標題:維生素C能預防感冒嗎?哈佛大學最新研究這樣說!

        (健康時報網端部記者 孔天驕)服用維生素C能預防感冒嗎?哈佛大學最新發表的一篇文章表明,對于一些在嚴苛環境做大運動量的人來說,維C能預防感冒,但對于普通人來說,并沒有什么作用。反而過量服用維C會導致腹痛、誘發痛風等問題。


      哈佛大學官網文章截圖

        普通人用維C能預防感冒?

        “我國維生素C片的藥品說明書中,沒有發現防治感冒的任何信息,普通人用維生素C預防感冒沒有足夠的證據。”清華大學附屬垂楊柳醫院臨床藥師陸紅柳稱,美國食品藥品監督管理局也曾經指出,到目前為止,尚未發現任何強有力的證據證明,維生素C具有防治感冒的作用。

        2007年發表在《歐洲臨床營養學》上的一項研究表明,運動員(如滑雪運動員、參加訓練的軍人和馬拉松運動員等)補充維生素C預防感冒的效果,遠遠高于普通人。對于普通人來說,維生素C防感冒的效果,幾乎可以忽略不計。解放軍總醫院第三醫學中心主任營養醫師劉慶春稱,感冒藥按作用機理分類可分為抗過敏藥、解熱鎮痛藥、鼻黏膜減充血劑和抗病毒藥。維生素C不具有解熱鎮痛、減少鼻黏膜充血和抗病毒的功效,能不能預防感冒有待證據證實。

        過量服用維C會導致哪些后果?

        “成年人每日維C所需僅為75~90mg。”陸紅柳告訴健康時報記者,有試驗證實,當每日攝入劑量超過400mg時,維C便可從尿液中排出,而酸化的尿液并不利于高尿酸患者體內尿酸的排出,從而增加了誘發痛風的風險。而當每日攝入2000mg以上維C時,還可能出現惡心、腹痛、腹瀉等不適,并且可能干擾血糖檢測。

        “即使需要補充維生素,維生素C不是補得越多越好。過量服用維生素C可能會導致結石,包括輸尿管結石和腎結石。”劉慶春補充,此外會造成對消化道的刺激,出現腹瀉、胃酸過多等。

        如何正確服用維C?

        生活中,很多人會將一些大劑量維生素C片的保健品長期服用,以預防感冒,這樣的做法也是不可取的。劉慶春提醒。

        維生素C廣泛存在于各類新鮮的蔬菜和水果中。陸紅柳說,對正常人來說,如果日常膳食結構合理,無需額外補充維生素C。

        “維生素C首選是從食物中獲取,蔬菜如西藍花、青椒、圓白菜;水果如山楂、大棗、沙棘,維生素C含量都很挺高。”劉慶春也認為,飲食中獲取維生素C要比補充制劑好很多,蔬菜水果里除了維生素C外,還含很多其他營養素。若由于特殊因素,無法從食物中補充,應再考慮制劑營養素。

      (責任編輯:徐燕妮)

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