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加工食品與反式脂肪

加工食品與反式脂肪

曾耀源

(廠商會檢定中心)





上星期 (2015年6月16日) 美國FDA 宣佈三年後全面禁止食品生產商使用 “不完全氫化油脂” (又稱 “部分氫化油脂”, Partially Hydrogenated Oils, PHOs)。目的是為了降低加工食品中 “人工” 反式脂肪的含量。



“天然” 與“人工”反式脂肪

食物中反式脂肪可分為兩類:


1. “天然” 反式脂肪 – 天然存於反芻動物之脂肪 (例如牛、羊的肉和奶)


2. “人工” 反式脂肪 – 在製造不完全氫化植物油時生成 (主要來源)


16a.jpg

圖片來源:FDA, 2015 http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm372915.htm


由於不完全氫化的植物油較耐高溫、較穩定和保存期較長,它被廣泛應用於各種加工食物 (例如人造牛油和酥皮餅點等)。這些食物是人們攝入 “人工” 反式脂肪的主要來源。



表一、可能使用不完全氫化油脂的加工食物例子

16Cb.jpg

資料來源:FDA, 2015

http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm372915.htm


所以,FDA禁用PHOs將能大大降低加工食物中 “人工” 反式脂肪的含量。



反式脂肪的害處

很多研究指出反式脂肪會增加有害的“壞”膽固醇 (低密度脂蛋白膽固醇)和降低有保護作用的“好”膽固醇 (高密度脂蛋白膽固醇),阻塞血管及增加心臟病的風險。


根據美國疾病控制與預防中心的資料1顯示,消除食物中的 “人工”反式脂肪每年可以避免10,000至20,000宗心臟病發作和3000至7000 宗心臟疾病相關死亡。

1 http://www.cdc.gov/nutrition/downloads/trans_fat_final.pdf



對於食物中反式脂肪的規管

世界衞生組織和聯合國糧食及農業組織建議,反式脂肪的膳食攝入量應少於每日所需能量的1%。


雖然各國普遍認為攝入反式脂肪越少越好,但對訂定食物中反式脂肪的限值未有共識。在丹麥,法例規定食物中每100克的脂肪不可含有超過2克的反式脂肪。在新加坡,不能超出2% 反式脂肪 (按重量比計算)的規定則適用於預先包裝食用油脂。


一些國家和地區(包括美國、加拿大、台灣和香港) 已強制要求在預先包裝食品的營養標籤上標示反式脂肪的含量,讓消費者在知情的情況下選購食物。

16Cc.jpg

圖片來源:FDA, 2015 http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm372915.htm



建議

香港政府最近大肆宣傳 “全城減鹽減糖”行動,推動和協助市民減低從食物中攝入過量的鹽和糖。最終目的便是要令市民實踐健康飲食的習慣。


同一原則下,政府應否加大力度令市民減少攝入毫無益處的反式脂肪呢?政府曾指過往反式脂肪含量較高的四大類別食物(西餅/蛋糕類;蛋撻、批及酥皮類;麵包類;以及其他烘焙食物類)最近被檢出的反式脂肪含量已有下降趨勢。這反映業界已開始自願調整生產工藝,減少使用不完全氫化油脂。


然而,要進一步和直接減少市面出售加工食物的反式脂肪含量,讓市民食得更健康,筆者認為政府可考慮採用FDA的做法。

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