However,theresearchersalsofoundthattheamountofmercuryinawoman'sbodyrosewiththeamountoffishshehadconsumed--andthatchildrenexposedtomoremercuryperformedworseonthesetests.Basedonthefindings,theysay,it'spossiblefishcouldhaveevengreaterbrainbenefitsforbabiesifmothers-to-beconsumedseafoodwithlowermercurylevels.
"Recommendationsforfishconsumptionduringpregnancyshouldtakeintoaccountthenutritionalbenefitsoffishaswellasthepotentialharmsfrommercuryexposure,"Dr.EmilyOkenofHarvardMedicalSchoolinBostonandhercolleagueswriteintheMay15issueoftheAmericanJournalofEpidemiology.
Advisoriesonmercurycontaminationofcertaintypesoflarge,long-livedfish--includingtunaandswordfish--haveraisedconcernsaboutseafoodconsumptionduringpregnancy,Okenandherteamnote.Ontheotherhand,fisharealsothechiefdietarysourceofomega-3fattyacids,substanceskeytoearlybraindevelopment,theyadd.
Tobetterunderstandtherisksandbenefitsoffishconsumption,Okenandherteamsurveyed341mothersabouttheirintakeoffishduringthesecondtrimesterofpregnancy,andthenhadtheirchildrencompleteabatteryoftestsofcognitivefunctionat3yearsofage.
Onaverage,womenreportedeating1.5servingsoffisheachweekwhiletheywerepregnant.Theamountofmercurythewomenhadintheirredbloodcellswasdirectlyrelatedtotheamountoffishtheyate.Children'stestscoresrosewiththeamountoffishtheirmothershadconsumed,butthosewhosemothershadmoremercuryintheirbodiesperformedlesswellonthetests.
Accountingfortheeffectsofmercuryexposurestrengthenedtheeffectoffishintake,andviceversa,theresearchersfound.Benefitswerestrongestforchildrenwhosemothersatemorethantwoservingsaweek.
"Ourfindingthatthebenefitoffishintakeisstrengthenedwithadjustmentformercurylevelssuggeststhatifmercurycontaminationwerenotpresent,thecognitivebenefitsoffishwouldbegreater,"Okenandherteamexplain."Maternalconsumptionoffishlowerinmercuryandreducedenvironmentalmercurycontaminationwouldallowforstrongerbenefitsoffishintake."
SOURCE:AmericanJournalofEpidemiology,May15,2008.
怀胎十月,每个月胎宝宝的情况都大不一样,那宝宝每个月的生长发育情况到底如何呢?如何了解宝宝的发育情况,不妨看看下文的详细介绍。怀胎十月,每个月胎宝宝的情况都大不一样,那宝宝每个月的生长发育情况到
孕期的宝宝是如何发育的呢?这是很多准妈妈和准爸爸们杜关心的问题,下面是从医学的角度分析的孕期各月胎儿的发育特征:受精卵经过多次分裂,形成一个细胞团,逐渐长大,同时开始分化,一部分变成胎儿,另一部分变成了供给胎儿营养并保护胎儿的附属器官。这是
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