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过来趴好自己选玩具:它在不同国家和地区代表了什么?
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揭阳市(揭东区、揭西县、惠来县、榕城区、普宁市)

  高价“富硒精华片”真能防癌吗?

  私域直播间商品多属高溢价产品正常饮食就能摄取充足的硒,过量补硒可能中毒

  编者按前不久,上海辟谣平台发布《1元秒杀10个鸡蛋可信吗?全国各地都有,有人竟为此花了几万元》一文,揭露了部分不法商家利用私域直播间,通过虚假宣传等方式,诱导老人购买高价产品。此后,不少读者提供线索并表示,这类直播间里有不少产品都被宣传具有“神奇的效果”,希望上海辟谣平台予以解释说明,正本清源,提醒老人不要上当。

  对此,上海辟谣平台将通过这一系列“直播间的秘密”,围绕直播间里常见的产品,去伪存真。

  “这些都是我妈妈通过私域直播间买的‘富硒精华片’,每瓶49.6克,10瓶一箱,共计4980元。这个‘硒’,到底有用吗?”读者戚女士向上海辟谣平台发来产品照片并询问。

  “富硒产品”是不少直播间里的热门货,除了“精华片”,还有富硒谷物、富硒苹果、富硒鸡蛋等。在巧舌如簧的主播嘴里,它们都具有“防癌”作用。

  正因如此,富硒食品价格高昂,不少“富硒精华片”售价高达每斤5000元。但它们真的有用吗?

  “硒”对人体有什么用?

  硒是一种人体必需的微量元素,对免疫系统有积极作用。但要明确的是,补硒未必能预防癌症。

  核查发现,“硒元素对人体很重要”的结论在很多官方研究报告中可以看到。例如,上世纪70年代,中国克山病防治研究组证实,缺硒是克山病流行的主要原因,补硒能有效预防克山病急性发作。1988年,中国营养学会将硒列为15种每日膳食营养素之一。

  当下流行的“补硒抗癌”说法,或许源自硒与免疫系统的关系。研究发现,几乎所有的免疫细胞中都有硒的身影。硒元素缺乏会加速细胞凋亡,导致内分泌失调,甚至造成免疫系统溃败。很多主播就是基于以上信息,将“补硒”与“防癌”联系在一起。

  可补硒不一定能防癌。国家健康科普专家库专家田艳涛指出,虽然有关研究表明血硒水平的高低与癌症的发生有一定相关性,但仅依靠摄取富硒食物很难达到抗癌作用。

  正常饮食不会缺硒

  也有消费者问:怎样判断自己是否缺硒?如果不吃富硒食品,会不会缺硒?

  其实,均衡饮食不会缺硒。日常生活中,富含硒元素的食物来源广泛,很多动植物都能从自然界中吸收硒元素,其中菌类、海鲜更是硒的良好来源。

  要注意的是,食物中硒元素含量高并不等同于人体能全部吸收。一般来说,人体对菌类中有机硒的利用率和吸收率较高,对鱼类和谷物等食物中含有的硒利用率则相对较低。同时,多吃水果和蔬菜有利于硒元素在人体内的消化和吸收。

  综合各种因素,中国疾控中心营养所指出,正常人群只要不偏食、挑食,注意均衡营养,就能摄取充足的硒,无需特别补充。如果居民特别关注硒的摄入,鉴于我国居民的饮食习惯,可以适当多吃点菌菇、水产、蛋乳类食物。

  过量补硒有害健康

  直播间里的富硒产品值得关注,不仅因为它们价格偏高,更因为吃多了可能不利于健康。

  从价格看,很多所谓的“富硒精华片”既不是药品,也不是保健品,而是普通食品,比如添加了硒的糖果等。还有些富硒农产品的硒含量虽然比普通农产品高一些,但能提供的硒总量同样有限,也属于高溢价产品。

  更要注意的是,人体对硒的需求量与硒中毒的量差距较小,稍不注意就可能补过量。

  具体来看,正常人每日所需的硒只有几十微克,而成年人每日摄入硒的最高限量为400微克,儿童和青少年每日摄入硒的最高限量更低。过度补硒不仅可能引发脱发、恶心、呕吐等硒中毒症状,还有诱发2型糖尿病、癌症等疾病的风险。

  再看部分“富硒精华片”所标注的硒含量,按照其推荐服用剂量,每天通过“富硒精华片”摄入的硒已经达到或超过推荐标准。如果一边服用“富硒精华片”,一边正常饮食,那么每天摄入的硒必然会超过推荐标准。而且,部分“富硒精华片”有适用人群,并非人人适用。

  中国疾控中心营养与健康所建议,如果无法确定自己是否需要补硒,可以到医院进行详细检查。缺硒人群或者贫硒地区的人群应当根据医嘱,通过合理服用硒补充剂、硒生物营养强化产品等途径提高硒摄入量,同时必须严格控制摄入量。本报记者任翀

  来源:解放日报

  西安4月25日电(记者张一辰)北京时间4月24日17时17分,神舟二十号载人飞船在长征二号F遥二十运载火箭的托举下,从酒泉卫星发射中心起飞升空。随后,神舟二十号载人飞船顺利进入预定轨道,发射任务取得圆满成功。陈冬、陈中瑞、王杰3名航天员搭乘神舟二十号载人飞船奔赴太空。

  从神舟一号飞船实现中国载人航天工程首次飞行,到神舟二十号载人飞船再度上演“神舟家族太空接力”,中国航天科技集团五院西安分院(下称:西安分院)载人航天工程团队为神舟飞船研制了中继终端、天线网络、仪表控制器应用软件等重要产品。

  在神舟二十号载人飞船的太空征途中,中继终端以及中继卫星上的有效载荷,如同机敏又忠诚的“通信使者”,为飞船和地面之间提供一条实时的信息传输“太空天路”。在飞船飞行过程中,这位“通信使者”将飞船在太空中的一举一动传输给地面的工作人员,有力地保障航天员与地面永不失联。

  此外,作为航天员与飞船交互的“桥梁”,飞船上的仪表控制器应用软件可将复杂的参数变成航天员可以一眼读懂的文字、图形和动画,当航天员需要了解飞船的实时姿态、飞行轨迹以及各分系统的“健康状态”时,只需通过飞船上的仪表便可精准收悉与飞船有关的所有参数,时刻掌握飞船各部分的运行状态。

  与上述几件“利器”不同,飞船上的天线网络系统虽只有字典大小,但却在关键指令和遥测收发、返回舱安全着陆等方面扮演着重要角色。如果将神舟二十号载人飞船的天线信号通路系统比作铁路运输系统,那么一路路信号就好似一列列火车,天线网络则更像是火车轨道和火车站调换轨道的道扳。

  西安分院表示,当神舟二十号载人飞船的通信信号要通过天线网络时,首先要对信号进行分路或合成,并对信号的杂波进行过滤,然后转换为可接收或发送的信号。该院研制团队在天线网络的材料选用、装配工艺以及结构的工效学设计等方面都进行了多轮的技术改进和试验验证,确保产品技术水平国际领先且安全可靠。(完) 新闻结尾 过来趴好自己选玩具:它在不同国家和地区代表了什么?的相关文章
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