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【环球网综合报道】 据英国《每日邮报》1月15日报道,据营养学家索菲 伯特兰(Sophie Bertrand)与英国Optegra眼科医院合作研究,列出了一系列有助于保持眼睛健康的有益食物,如鲑鱼可有效预防失明,而绿茶可防止紫外线侵害。目前,营养学家揭示最有益于眼睛健康的五种食物:大马哈鱼、鳄梨、鸡蛋、胡萝卜及绿茶。
1. 鲑鱼
研究表明,遵循地中海饮食习惯的人,食用富含欧米茄-3脂肪酸的鱼类,患黄斑变性的风险较低(黄斑变性是一种导致视力模糊的疾病)。冷水鱼,如鲑鱼和金枪鱼对眼睛健康有益。因其富含欧米茄-3脂肪酸,可有效防止眼睛干涩、黄斑变性甚至白内障。2008年英国的一项研究发现,在50岁以上(含50)人群中,每周至少吃一次富含欧米茄-3脂肪酸鱼类的人群比每周少于一次的人患新血管年龄相关性黄斑变性(导致视力下降的主要原因)的风险减少一半。
2. 牛油果
牛油果富含抗氧化剂叶黄素和玉米黄质可保护视力,减少老年人常见患老年性黄斑变性和白内障风险。
法国的一项研究发现,玉米黄质含量高与降低老年性黄斑病变风险之间存在密切联系。老年性黄斑病变是一种眼科疾病,其诱发因素包括高血压、长时间暴晒以及饮食中缺乏抗氧化剂维生素和矿物质。
牛油果等还富含维生素C,对眼睛健康至关重要。世界卫生组织表示,多达20%的白内障患病是由于过度暴露在紫外线下引起的,维生素C等营养物质可有效防止紫外线,有益于眼睛健康。
3. 鸡蛋
鸡蛋富含维生素A,对保护眼睛健康至关重要。维生素A降低患干眼症风险,有助于预防一些眼睛疾病如色素性视网膜炎。 蛋黄还含有玉米黄质,可有效防止紫外线。鸡蛋也含有叶黄素,被视为是“眼睛维生素”。德克萨斯州科学家将鸡蛋中的维生素含量与33种不同的水果和蔬菜进行比较,发现蛋黄中叶黄素含量最高。由于鸡蛋胆固醇含量高,多年来专家一直建议限制鸡蛋的摄入量,因为胆固醇是诱发冠状动脉疾病的危险因素。然而,此项研究的研究人员建议,应重新考虑限制鸡蛋摄入量。此外,普渡大学研究发现,人们食用煮熟鸡蛋,能够从中获得更多有益眼睛健康的类胡萝卜素。
4. 胡萝卜
胡萝卜富含维生素A及胡萝卜素。缺乏维生素A会导致干眼症,有眼睛干燥、眼睑肿胀和角膜溃疡的症状。胡萝卜素有助于眼睛吸收维生素A,维生素A在保护视力方面起至关重要的作用。牛奶、奶酪、蛋黄、肝脏和甘薯中也含有维生素A。
5. 绿茶
绿茶含有一种儿茶素的健康物质,具有抗炎和抗氧化的特性。绿茶中的抗氧化剂,如维生素C、叶黄素和玉米黄质可预防癌症、心脏病和眼疾。一种被称为没食子儿茶素的特殊类黄酮有益于眼睛健康。饮用绿茶后,没食子儿茶素可提供长达20小时对眼睛保护。据2007年韩国的一项研究,绿茶也有保护眼睛免受紫外线伤害的功效。(实习编译:马妍 审稿:刘洋)
——摘自《央视网》