高价补硒是否必要2019(初中阅读)

高价补硒是否必要2019(初中阅读)
高价补硒是否必要2019(初中阅读)

高价补硒是否必要?

近年来,随着“富硒大米”、“富硒鸡蛋”、“富硒茶”、“高硒水果”、“富硒康”等一系列富硒农产品和含硒保健品在市场上的畅销,硒元素与人类营养和健康的关系逐渐为大家所关注。

硒,1817年由瑞典化学家永斯·雅各布·贝采利乌斯发现,命名为Selene(希腊语是“月亮”的意思),化学符号是SE.在化学元素周期表中位于第四周期VIA族,是一种非金属。

硒是各种生物体(包括细菌、植物和动物)所必需的营养元素。在国内外医药界和营养学界,硒被誉为“生命的火种”、“长寿元素”、“抗癌之王”、“天然解毒剂”和“健康的保护神"等,研究表明硒在抗氧化、抗衰老、抗癌、增强免疫功能、预防心血管疾病等方面可能存在较大的潜能。

人体细胞在代谢过程中会不断产生自由基,自由基能与活性较强的含氧物质结合形成健康和长寿的杀手——“活性氧自由基”。目前世界医学界已公认:自由基是使人类衰老的罪魁祸首之一,并同心血

管疾病.癌症、糖尿病等百多种疾病密切相关。面对如此严重的自由基威胁,机体形成了一整套抗氧化防御体系,而硒就是这个体系中的重要成员。希腊雅典大学DuntasLH等人总结了近年来与硒相关的多项流行病学研究,他们发现,当给缺硒人群补充一定量的硒后,许多之前受损的生理机能会得到明显改善。

硒是癌细胞的有效杀伤剂,它能阻断癌细胞的重要能量来源,提高癌细胞中环腺苷酸的水平,在体内形成抑制癌细胞分裂和增殖的内环境。波兰科学家曾在2008年的一项流行病学研究中发现,癌症的发病率与血中硒含量呈负相关,土壤及食物含硒量低的国家和地区癌症发病率明显高于含硒量高的国家和地区。

硒是维持心脏正常功能的重要元素,对心脏肌体有保护和修复的作用。德国研究人员对近十年来硒与心脑血管系统正常功能及相关疾病关系的研究进行了深入探讨,认为科学补硒对于预防高血压、动脉硬化等心脑血管疾病可能有较好的作用。

虽然目前关于确的各种生理功能及其在生物医学中应用的相关

研究备受关注,科学家们已经获得了一些重要成果,然而迄今为止,

硒维系人体健康的主要分子机制及其与疾病发生发展的复杂关系尚

不完全清楚,未来仍然需要大量的基础与临床科学研究。我们期望通过越来越多硒相关的生物学实验并结合临床实践,进一步发掘并验证

硒的“洪荒之力

....”,服务人类健康生活。

虽然硒在维系人体健康方面起着举足轻重的作用,但是人体内不存在长期贮藏硒的器官,因此需要不断从饮食中补充新陈代谢所需的硒。日常生活中有很多含硒高的天然食物,比如肉、蛋、鱼、海产品及动物的心、肝、肾等脏器,其中蛋类含硒量多于肉类。蔬菜中如荞菜、芦笋、豌豆、大白菜、南瓜、洋葱、番茄等也含一定量的硒。多吃这些食物可以安全有效地补硒。

不过值得注意的是,硒虽然重要,但并非补得越多越好。

根据《中国居民膳食营养素参考摄入量》(2016版),成年人每人每日硒元素的推荐摄入量为60微克,可耐受的最高摄入量为400微克。正常人群,平时只要不偏食、挑食,注意均衡营养,就可以摄

取充足的硒,无需特别的补充;而缺硒成年人每日食物外补硒50微克即有保健作用。

补硒需要精确到微克,人体对硒的需求量距离硒中毒的量其实只有“一步之遥”,稍有不慎就可能会引发不良后果。

有些人自认为缺硒,就把富硒食物当作营养品来长期服用,使人体处在一个高硒状态,而长期处在高硒状态下可能会发生硒中毒。一旦硒中毒,人体会表现出皮肤痛觉迟钝、四肢麻木、头昏眼花、食欲不振.头发脱落、指甲变厚、皮疹、皮痒、面色苍白、胃肠功能紊乱、消化不良等一系列症状,甚至危及生命。

因此,补硒虽有必要,但也不能多补!如果不能确定自己是否需要补硒,建议到医院进行详细检测来确定。

(作者:彭婷张焱有改动)1.你认为文章的题目拟写的好吗?请说明理由。

2.简述本文的说明思路。

3.文中加点词语“洪荒之力”的含义是什么?

4.为什么说“补硒虽有必要,但也不能多补”?

答案解析

1.好。题目所示问题指向现实生活现象,容易引发读者的思考和阅读的兴趣;题目也统摄了文章的说明内容暗示了硒与人类营养和健康的关系。

2.首先,由现实生活现象引出对硒元素基本知识的介绍:接着,说明目前研究发现的硒对人体健康可能具有的潜在作用;最后,指出“补硒"的正确认知。

3.指硒元素本身具有的益于人体健康的强大作用力。

4.(1)人体内不存在长期贮藏硒的器官,需要不断从饮食中补充新陈代谢所需的硒。(2)正常人群,只要均衡膳食,就可摄取充足的硒,无需特别的补充。(3)补硒需要精确到微克,稍有不慎就可能会引发不良后果。

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