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1、大家学习网第一部分：FindYourselfPackingItOn?BlameFriends Obesitycanspreadfrompersontoperson,muchlikeavirus,researchersarereportingtoday.Whenonepersongainsweight,closefriendstendtogainweight,too. Theirstudy,publishedinTheNewEnglandJournalofMedicine,involvedadetailedanalysisofala
2、rgesocialnetworkof12,067peoplewhohadbeencloselyfollowedfor32years,from1971to2003. Theinvestigatorsknewwhowasfriendswithwhomaswellaswhowasaspouseorsiblingorneighbor,andtheyknewhowmucheachpersonweighedatvarioustimesoverthreedecades.Thatletthemreconstructwhathappenedovert
3、heyearsasindividualsbecameobese.Didtheirfriendsalsobecomeobese?Didfamilymembers?Orneighbors? Theanswer,theresearchersreport,wasthatpeopleweremostlikelytobecomeobesewhenafriendbecameobese.Thatincreasedapersonschancesorbecomingobeseby57percent.Therewasnoeffectwhenaneighb
4、orgainedorlostweight，however,andfamilymembershadlessinfluencethanfriends. Itdidnotevenmatterifthefriendwashundredsofmilesaway,theinfluenceremained.Andthegreatestinfluenceofallwasbetweenclosemutualfriends.There,ifonebecameobese,theotherhada171percentincreasedchanceofbec
5、omingobese,too. Thesameeffectseemedtooccurforweightloss,theinvestigatorssay.Butsincemostpeopleweregaining,notlosing,overthe32years,theresultwas,onaverage,thatpeoplegrewfatter. Dr.NicholasA.Christakis,aphysicianandprofessorofmedicalsociologyatHarvardMedicalSchoolandapr
6、incipalinvestigatorinthenewstudy,saidoneexplanationwasthatfriendsaffectedeachothers’perceptionoffatness.Whenaclosefriendbecomesobese,obesitymaynotlooksobad. “Youchangeyourideaofwhatisanacceptablebodytypebylookingatthepeoplearoundyou,”Dr.Christakissaid. Theinvestigator
7、ssaytheirfindingscanhelpexplainwhyAmericanshavebecomefatterinrecentyears–eachpersonwhobecameobesewaslikelytodragalongsomefriends!club.TopSage.com大家学习网 Theiranalysiswasunique,Dr.Christakissaid,becauseitmovedbeyondasimpleanalysisofonepersonandhisorhersocialcontactsandins
8、teadexaminedanentiresocialnetworkatonce,lookingathowaperson'sfriend'sfriends,orinfluenceonaperson'sweightorasp
