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標題: 維生素類飲料的選購方法 [打印本頁]

作者: earsowwn1235    時間: 2013-2-24 14:22     標題: 維生素類飲料的選購方法

既然天熱的時候出汗多,大家也特別愛喝飲料。現在市面上有不少飲料裏面都加了維生素,這些飲料該怎麼挑選呢?它們真的對補充維生素起到很大作用嗎?

  的確,天氣酷熱的時候,人們需要格外注意補充維生素,僅僅喝白水還不夠。因為汗液不是白水,其中內容豐富,從少量的蛋白質、氨基酸,到鈉、鉀、鈣、鎂,再到各種水溶性維生素,都能在汗液中找到。身體蒸發汗液,使血液集中於體表,對於一些本來身體虛弱的人來說,胃腸消化液分泌減少,會導致食欲不振和消化功能下降。缺乏鉀會讓人對暑熱的抵抗力下降,缺乏B族維生素會讓人們的食欲更加下降。越熱越不想吃,越不想吃越不扛熱,成為一個惡性循環。

  在這種時候,喝什麼就顯得更加重要。如果飲料中能幫助補充一些維生素和礦物質,顯然是件好事。如果在家裏自製各種健康飲料、茶水和綠豆湯,自然是最為理想。不過,在外行走的時候,很多時候就只能依靠市售飲品了。那麼,維生素飲料能幫上忙麼?

  首先是維生素品種的問題。只含有一種維生素,不如同時含有多種維生素好。人們吃西瓜、吃水果就可以補充不少維生素C,但B族維生素大多難以從水果當中補充。它們主要來自於糧食、豆類、薯類和動物性食品。所以說,在高溫季節,各種B族維生素要比維生素C更容易發生缺乏。

  其次是維生素數量的問題。如果價格相同,維生素的含量高一些,補充的效果也會大一些。如果一種飲料宣稱能夠補充某種營養素,也就是說它富含某種營養素,那麼它至少應當能夠供應這種維生素的30%的日需要量。比如說,如果是供應維生素C,那麼一瓶當中的含量應當超過30毫克。

  怎麼來計算這個數值呢?如果包裝上沒有寫明營養素的添加量,幾乎可以不考慮它的營養作用,誰知道其中能有多少呢?沒有數量就沒有人對它負責。如果包裝上有“營養成分表”,那麼要看一看是說100毫升中的含量,還是一瓶中的含量。然後看它一瓶中有多少毫升。

  比如說,如果某產品標籤上寫明,100毫升中的維生素C含量是20毫克,占NRV(營養素參考值)的20%,而這瓶飲料的總量是500毫升,那麼一瓶中所提供的維生素C總量就是100毫克,為NRV的100%。如此,這瓶飲料對於供應維生素C還是比較有幫助的。

  此外,還要考慮到維生素穩定性的問題。各種飲料都是透明瓶子包裝,而包括維生素C、維生素B2、維生素B6在內的多種維生素都是比較怕光的。所以,儲藏時間越長,含量就越低。更糟糕的是,維生素的一些降解產物可能有一定毒性。所以,如果瓶子能夠降低透明性,或者放在棕色瓶、藍色瓶、紅色瓶中,維生素的損失就會小一點。

  然後是綜合營養價值的問題。喝到維生素的同時,也可能喝到太多的糖分,太多的磷,太多的色素香精添加劑之類,那麼這樣的產品也就不值得多飲了。例如,有的產品口感相當甜,糖含量高達8%-10%,那麼,喝500毫升的飲料,也就同時得到了40-50克糖。如果一天喝三瓶,就相當於吃一碗半米飯的能量,促進發胖的危險不容忽視!

  然而,人們通常不會認為喝飲料和吃米飯一樣能飽,而這些以高果葡糖漿為甜味來源的飲料本身,也不會給人帶來明顯飽感。很多人往往會奇怪“為什麼我喝涼水也長胖”,其實這是因為那本來就不是普通的涼水,而是冰鎮過,並帶著維生素、果味之類幌子的糖水!

  最後是性價比的問題。這就要好好看看標籤上的原料、維生素含量、重量和價格等多個指標了。比較一下各種飲料,看看誰提供的維生素品種多,總量高,包裝比較令人放心,含糖量較低,然後再參考價格,算出每100毫升的價格,就能心中有數。
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