冰红茶好喝，可莫要贪杯哦！--引发肾功能衰竭

2015年4月3日讯/生物谷BIOON/--新英格兰医学杂志近日报道了一个案例，一名56岁的老人患上了肾功能衰竭，根据医生诊断，他平日的生活习惯--每日必饮冰红茶是患病的主要诱因。
这名病人的肾病并未康复，需依赖透析才能维持正常肾功能。他的医生AlejandraMena-Gutierrez在他的报告中强调了饮茶要适中。“并不是不建议饮茶，而是要控制好量，否则会伤害你的肾!”
2014年5月，这名病人感到虚弱和疼痛，入院接受检查，发现他的尿液中含有过量的草酸钙结晶，这也是肾结石的主要成分。但该名病人的家族中并没有类似的疾病患者，他本人之前也没有肾结石，为了缓解症状，医生只好采取透析的办法。
病人告诉医生他每天要喝16杯冰红茶，而冰红茶中含有特别多的草酸，草酸摄入过多极易引发肾病。
Mena-Gutierrez医生说像这种情况，肾病诱因只能是冰红茶摄入过多，而不可能是其他原因。
在美国，人均每天要摄入多达152-511毫克草酸盐，而营养和饮食学会建议的草酸盐摄入量仅仅是40-50毫克。每100毫升红茶中含有50-100毫克草酸盐。“我的这名病人每天饮16杯冰红茶，换算过来，也就是每天要摄入1500毫克草酸盐，比美国平均水平还要高3-10倍。”
新英格兰医学杂志2013年报道了一篇文章，一名女性患上了极罕见的骨骼疾病，骨骼氟中毒，究其原因是因为她连续17年每天都要喝掉100个茶叶包！茶水中含的氟化物累积在身体里，最终引起骨骼氟中毒。
茶一直是大家所推崇的健康饮品，有很多保健功效，适量饮用有助身心健康，但是饮茶过量可是有诸多弊端，甚至酿成大祸。所以，喝茶还是要适中啊！（生物谷bioon.com）
英文原文：TooMuchIcedTeaBlamedforMansKidneyFailure
Aftera56-year-oldmanexperiencedkidneyfailure,hisdoctorsdiscoveredthathishabitofdrinkingexcessiveamountsoficedteaeverydaywaslikelytheculprit,accordingtoanewreportofhiscase.
Themanskidneyfunctionhasnotrecovered,andheremainsondialysis,saidDr.AlejandraMena-Gutierrez,ofUniversityofArkansasforMedicalSciences,whotreatedthepatientandwrotethereportofhiscase.Theauthorsofthereportstressedthatmoderationiskeywhenitcomestodrinkingtea.
"Wearenotadvisingagainstteaconsumption,"Mena-Gutierrezsaid."Ifyouarehealthyanddrinkteawithmoderation,itshouldnotcausedamagetoyourkidneys."
InMay2014,themanwasadmittedtoanArkansashospital,feelingweakandachy.Testsshowedthathisurinehadhighlevelsofcalciumoxalatecrystals,whicharethecomponentsofkidneystones.
Butthemanhadnofamilyhistoryofkidneydisease,norhadhepreviouslyhadkidneystones,accordingtothereport.Totreathiskidneyfailure,thedoctorsbegandialysis.[7FoodsYouCanOverdoseOn]
Themantoldhisdoctorsthathedrank16glassesoficedteadaily.Blacktea—whichwasintheicedteathemandrank—isarichsourceofoxalate,acompoundthatmaycontributetokidneyproblemsifconsumedinhighquantities.
Thedoctorsconcludedthatthemansexcessiveconsumptionofoxalateintheicedtealikelyledtothekidneyfailurethatwasprogressingrapidly.
Themanscondition"couldnotbeexplainedbyanyothercauseinthiscase,"Mena-GutierreztoldLiveScience.
TheaveragepersonintheUnitedStatesconsumesbetween152to511milligramsofoxalateaday,accordingtothereport.Thisishigherthanthe40to50mgperdayrecommendedbytheAcademyofNutritionandDietetics.
Therearebetween50and100mgofoxalateper100mlofblacktea,theresearcherswroteinthereport.
"With16cupsofteadaily,thepatientsdailyconsumptionofoxalatewasmorethan1500mg—alevelthatishigherthantheaverageAmericanintakebyafactorofapproximately3to10,"theywrote.
Inanotherreport,publishedin2013intheNewEnglandJournalofMedicine,researchersdescribedararecaseofbonediseasecalledskeletalfluorosisinawomanwhodrankapitcherofteamadefrom100teabagsdaily,for17years.
Inthewomanscase,herbonediseasewaslikelycausedbyconsumingtoomuchfluoride,amineralthatisfoundinteaanddrinkingwater,accordingtothatreport.
Thenewreportwaspublishedtoday(April1)intheNewEnglandJournalofMedicine.
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