绿茶可防冠心病.doc

茶起源于中国，作为中国人饮食结构中不可或缺的元素，绿茶常被誉为“国饮”。长期以来，关于绿茶效用的说法不一而足，瘦身减脂、抗衰老、改善消化、预防冠心病等等。而近日，由江苏省人民医院心内科教授王连生主任医师所带领的科研小组临床研究绿茶的一项功效给出了证明：长期饮用绿茶确实可以预防冠心病，不过对男性的保护效果要优于女性。绿茶确实可防冠心病王连生表示，他们的研究小组从2008年起开始了一项对照研究，他们收集了520名首次在江苏省人民医院接受冠状动脉造影的患者饮用绿茶的习惯及其他生活方式方面的资料。这些患者年龄在50-80岁之间，其中男性379名，女性141名。通过统计分析发现，饮用绿茶可以降低冠心病发病风险，另外随着每月饮用绿茶的量的增加，冠心病的发病危险也逐渐降低。该研究结果发表在日本循环杂志上。王连生告诉记者，对绿茶的研究荟萃分析显示，饮用最高浓度绿茶与减少冠心病之间存在明显的显著性关系。若每天增加饮用绿茶一杯，可减少10%的冠心病发生率。另外，随着饮用绿茶年限的增加、开始饮用绿茶年龄的减小，冠心病的风险同样是逐渐降低的。通过对目前所有数据总结后认为：饮用绿茶可起到减少冠心病的作用。3种成分起主要作用王连生介绍，冠心病是由于供应心脏本身的冠状动脉管壁形成粥样斑块造成血管腔狭窄所致的心脏病变。能够引发病变的原因很多，而高血压高血脂、炎症等因素不吝于招致疾病最直接的“幕后黑手”。王连生说，首先，绿茶及其中的茶多酚等成分具有降血脂、抗氧化、抗炎、改善血管内皮功能、抗血小板聚集、抑制斑块中新生血管的形成以及抑制血管平滑肌的增殖及迁移的作用。其次，绿茶中含有丰富的维生素，能够强化微血管，增强血管柔韧性、弹性和渗透性，预防血管硬化。另外，绿茶中另一成分咖啡碱能兴奋精神，促进血液循环，又能松弛支气管的肌肉，有利于预防冠心病。对男性保护作用更明显在这项对照研究中，在女性人群中科研小组未能够发现饮用绿茶可以显著降低冠心病的发病风险。王连生解释，出现这种情况，一来和调查的人数有关，女性调查人数样本量比男性要少，二来女性情况也比较特殊。女性体内的雌激素本身就有保护心脏的作用，在女性更年期以前罹患心脏病的可能性要比男性小得多。因此绿茶对女性心血管的保护作用也就显得不那么突出了。在对照研究中，同时还有13项关于红茶的荟萃分析，结果显示红茶与冠心病之间不具有存在统计意义的显著性联系，也就是说饮用红茶并不能达到预防冠心病的效果。这主要是绿茶和红茶的发酵程度不一样。绿茶是完全发酵茶，发酵以后成分也会发生变化。很多地方饮用红茶的习惯，比如加牛奶、加糖等，也不算健康。一天3杯绿茶最为适宜从健康的角度来看，绿茶几乎是最理想的茶品。王连生建议，市民一天以饮用三杯左右的量为宜，除此以外，由于绿茶中的咖啡碱容易让人兴奋、血压升高，因此高血压患者不应喝太多、太浓的茶。刚开始喝茶的人，要遵循“适量、长期”的饮茶原则，少量饮茶、长期坚持，其对于心脏的保护功效才更明显。不过饮茶也需要因人而异，因为茶会影响人体对于铁、钙、锌等矿物质的吸收，贫血患者、小孩、孕妇喝茶都不宜过多。另外值得一提的是，饮茶忌过烫，因为超过65的茶水，会大大增加患食道癌的几率，故此，沸水泡茶4分钟之内，是一定不能喝的。王连生还提醒广大患者，在培养良好饮茶习惯的同时也应避免不良的生活习惯，要做到饮食上低盐低脂、生活中戒烟戒酒，与此同时饮用绿茶，长此以往，将有效减少冠心病的发生。Tea originated inChina,as an indispensableelement in thedietChineseGreen Tea,oftenknown as the national drink.For a long time,aboutGreen TeautilitythatThis is not the only one.,thin body /post/55.html fat loss,anti-aging,improve digestion,prevention of coronary heart disease.Recently,afunctionisled byProfessor Wang Liansheng,director ofthe Department of Cardiology of Jiangsu Province Peoples Hospitaldoctors scientificclinical research teamGreen Teaproved:long-term drinkingGreen Teacanprevent coronary heart disease,butthe /post/466.html protective effecton menthanwomen.Green Teacanpreventcoronary heart diseaseWang Liansheng said,the teambegan acase-control studyfrom 2008 onwards,they collected520firstunderwent coronary angiographyinpatients withGreen TeaJiangsu Province Peoples H drinkinghabitsand otherlifestyle information.These patientsaged between 50-80 years old,379 males,141 females.Through the statistical analysis found thatdrinkingGreen Tea,can reduce therisk of coronary heart disease,andwith the increaseofthe amount ofmonthly drinkingGreen Tea,risk of coronary heart diseasehas been gradually reduced.The study was published inthe journal Circulationin japan.Wang Liansheng tells a reporter,theGreen Tearesearchmeta analysis shows,there was significantrelationshipbetweendrinkingthe highest concentrationGreen Teaandreduce coronary heart disease.If every dayto drinka cup ofGreen Tea,10% reduction inthe incidence of coronary heart disease.In addition,with the increaseof drinkingGreen Teayears,starts to decreasedrinkingGreen Teaage,coronary heart diseaserisk is alsogradually reduced.Based on thesummary ofalldatathat:drinkingGreen Teacan reducecoronary heart disease.3 componentsplay a major roleWang Liansheng introduces,coronary heart disease isdue to the formation ofatheromatous plaquecausing vascularstenosisinducedwallsupplythe heart itselfthe coronary arteryheartdisease.Many reasonscan cause thedisease,whileathigh blood pressure and high blood fat,inflammation and other factorstocause diseasethe most directbehind.Wang Liansheng said,first of all,Green Teaandtea polyphenols and othercomponents havehypolipidemic,antioxidant,anti-inflammatory,improve endothelial function,anti platelet aggregation,inhibiting the angiogenesis ofplaquesand theproliferation and migration ofvascular smooth musclefunctioninhibition.Secondly,Green Teais rich in vitamins,can strengthen thecapillaries,enhance hemalflexibility,elasticity and permeability,the prevention of vascular sclerosis.In addition,excited mindanothercaffeinecanGreen Tea,promote blood circulation,andrelaxation of bronchialmuscle,is conducive tothe prevention of coronary heart disease.Moreobviousprotective effectsonmaleIn thiscase-controlstudy,among womenteamfailed tofinddrinkingGreen Teacan significantly reducethe risk of coronary heart disease.Wang Liansheng explained,appear this kind of circumstance,the numberoneand survey,samplesurveythe number ofwomenless than men,andwomenaremore special.The estrogen in womenis itself acardioprotective effects,likely to suffer fromheart diseaseinmenopausal womenpriortomuch less than men.So theprotective effectoncardiovascularGreen Teawomenalso appearsless prominent.In a controlled study,at the same time there are 13items on theBlack Teameta-analysis,results showed that there wasnotsignificant relationshipexistsbetween statisticalsignificanceBlack Teaand coronary heart disease,that is to saydrinkingBlack Teacannot achievethe effect ofprevention ofcoronary heart disease.This is mainlythe fermentation degreeGreen TeaandBlack Teadifferently.Green Teais completelyfermented tea,compositionchangesalsofermentation.ManylocaldrinkingBlack Teahabits,such asmilk,sugarand so on,is nothealthy.3 cups a dayGreen Teais most suitableFrom the health point of view,Green Teais almost the mostidealtea.Wang Liansheng suggested,the publicday bydrinking three cups ofor so isadvisable,in addition,because thecaffeineinGreen Teapeople get excited,elevated blood pressure,therefore,patients with hypertensionshould notdrink too much,too strong tea.At the beginning ofpeople drink tea,teato follow theprinciple ofmoderate,long-term,a small amount oftea,insist for a long time,theheartis moreobviousprotective effects.Butteaalsodiffer from man to m