Peoplewhoareslightlyoverweightormildlyobese(肥胖的)havealowerriskofearlydeaththannormalweightindividuals(个人;个体)accordingtoanewanalysisofnearly100internationalstudies.

Thestudiesmostconductedwithinthepastdecadeincludedaboutthreemillionadultsfromaroundtheworld.TheresultofthesestudiesbyresearchersattheNationalCenterforHealthStatisticsinMarylandpartoftheU.S.CentersforDiseaseControlandPreventionshowsthatslightlyoverweightorobesepeopleweresixpercentlesslikelytodiefromallcausescomparedtopeopleofnormalweight.Buttheresearchersfoundthatseriouslyobeseindividualswerestillata30percentgreaterriskofdeathcomparedtohealthy-weightindividuals.

StudyleadauthorKatherineFlegalsaysshewasnotsurprisedthatoverweightpeoplewouldnothaveahigherdeathrisk.“Becausewe'dactuallyalreadyreadalotofthisliteratureandrealizedthatdeathratesforoverweightwouldbeatleastnothigherthannormal[weight"shesaid.“Iguesslwasalittlebitsurprisedthatitwasdefinitelylower.Andlwasalsosurprisedthatthelowerratesofobesitydidn'tseemtodifferfromnormalweight."

ButFlegalstressesthedifferenceindeathratesappeartobesmallbetweennormal-weightpeopleandoverweightandmildlyobeseindividuals.

ThefindingbyFlegalandcolleagueshaveraisednewquestionsaboutthereliability(可靠性)oftheso-called"bodymassindex"orBMIameasurementofbodyfatasaratio(比例，比率)ofheighttoweightthathasbecomepopularinrecentyearsamongpublichealthexpertstomeasurepotentialhealthrisks.

ButHeymsfieldwarnsthatindividualsshouldnotconcludethatit'sokaytoputonextrakilogramssincebeingatahealthyweightlowerstheriskforheartdiseaseanddiabetes.

25.KatherineFlegalfeelssurprisedatthefactthat____.

A.obesepeoplehavehigherdeathrates

B.slightlyobesepeoplehavelowerdeathrates

C.obesepeopletendtodieearly

D.deathrateshavenothingtodowithbodyweight

26.Whatdowelearnfromthefifthparagraph?

A.BMImaynotbesoreliable.

B.ThestudyprovidesfurtherevidenceforBMI.

C.BMItellsnothing