莴笋有助降血压的蔬菜

huogengjia

隋炀帝大业年间（公元605～608年），地处西亚的呙国与隋朝有使节往来，隋人得莴苣菜种，带入中原栽培。由于交换代价极高，隋人称之为千金菜。莴苣引入中国后，得到了推广。据记载，康熙首次南巡，在南京吃到莴笋，赞不绝口，致使莴笋身价百倍。

莴笋经除叶、削北京哪家医院治疗白癜风病好皮、切片、晾晒等工序后，可制成脱水蔬菜，其产品以安徽涡阳县最为盛名，名曰涡阳苔干。涡阳苔干制品刀刀笔直，苔片厚薄、长短一致，根部一端根根相连，苔片大部分水分蒸发，可以扎把上市出售。复水后清香扑鼻，风味独特。1958年周恩来总理品尝此菜时，因清脆有声，特命之为响菜。

高钾低钠有助降压

莴笋为高钾低钠蔬菜，每百克莴笋含钾为212毫克，含钠36.5毫克。北京哪家医院治疗白癜风病好钾是维持人体生命的必需元素，它能使动脉扩张，降低外周血管阻力，促进尿钠排泄，降低心血管负担，能使高血压患者的动脉壁增厚有所减轻，达到降低血压的目的。

我国民众的膳食中钾摄入量普遍偏低，膳食钠与钾的比例为31，这与高血压的发病有关。补钾的方式不外乎药补和食补两种，食补更为安全。每天补钾60毫摩尔，可使平均收缩压降低4.4毫米汞柱，平均北京哪家医院治疗白癜风有名舒张压降低2.4毫米汞柱。西方国家的人每日钾摄入量为3～4克，我国规定成人每日钾摄入量为2～3克。莴笋中的钾含量丰富，是钠含量的6倍，有利于调节体内盐的平衡。

不同于一般蔬菜的是，莴笋含有丰富的氟元素，可参与牙齿和骨骼的代谢。莴笋所含人体可吸收的铁元素，对有缺铁性贫血的病人十分有益，经常食用新鲜的莴笋，可以防治缺铁性贫血。

莴笋叶营养价值更高

有人在北京哪家医院治疗白癜风最好吃莴笋时将莴笋叶丢弃，这非常可惜。莴笋叶中的营养素含量比莴笋茎还要高，如每百克莴笋叶含维生素C13毫克，茎为4毫克；每百克莴笋叶含胡萝卜素880微克，茎为150微克。

莴笋叶中还含有一种味甘微苦乳状的汁液，汁液里有大量菊糖类物质。菊糖类物质是一种功能性多糖果聚糖，也是目前发现的最易溶解的膳食纤维。它能增加体内的双歧杆菌数量，从而抑制肠内沙门氏菌和腐败菌的生长，促进肠胃功能。膳食纤维还能降低血脂，控制血糖，控制体重。

链接

■挑选圆叶莴笋品质佳

莴笋根据其叶片的形状可分为圆叶和尖叶两个类型。圆叶莴笋的茎粗大，中下部较粗，两端渐细，品质好。尖叶莴笋叶端尖，茎似棒状，下部粗上部渐细，品质不及圆叶莴笋。春莴笋茎短粗、不弯曲、皮薄、质脆、水分充足、笋条不蔫萎，无空心、表面无锈斑的品质最佳。

■烹调焯一下吃口感好我科学家发明深穿透无线通信救援设备

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