至有營﹕飼料改變 雞蛋更有營

(明報)2011年4月25日 星期一 05:15
【明報專訊】為了令雞蛋更有營養，近年部分農場在雞隻飼料中添加了奧米加三脂肪酸，使生產的雞蛋亦含有這種可保護心臟和促進腦部發展的成分。

此外，飼料配方的調整也令雞蛋的營養成分有所改變。根據美國    農業部的最新研究，現時歐美出產的雞蛋膽固醇含量較2002年下降了13%，維他命D含量則大升64%。業界人士相信，這與歐美多國為防止瘋牛症    自1990年代起陸續禁用肉骨粉作為雞飼料，而改為採用含粟米及小麥的高蛋白飼料有關。

煎蛋增脂肪

營養成分的改變，是否意味著雞蛋比以前更「有益」，多吃無妨？劉碧珊認為，這類雞蛋的營養成分確是更貼近健康指引，但也不能因此而大吃特吃。在均衡飲食的基礎上，適量食用雞蛋才是上策。

蛋不但要注意食用量，還要精明選擇烹調方式，才能吃得健康。雞蛋烹調方式變化多端，煎、炒、蒸、煮皆可，但煎及炒時需用油，難免增加熱量和脂肪的攝取（見表二）。「水煮和蒸是較佳的烹調方法，使用易潔鑊煎蛋可減少油的用量，也是折衷方法之一。」

唔熟唔食

很多人喜歡吃半熟蛋，貪其口感嫩滑，但從健康的角度看，蛋還是吃全熟的好。「全熟蛋比生蛋更容易消化，營養吸收自然更好，而且雞蛋可能帶有沙門氏菌，生吃存在衛生問題，長者、孕婦及幼兒等抵抗力弱，絕對不宜吃生蛋。」她提醒，烹調雞蛋時，必須將蛋加熱至攝氏60度以上，維持3至4分鐘，確保熟透。

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