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1、大家学习网第一部分：FindYourselfPackingItOn?BlameFriendsObesitycanspreadfrompersontoperson,muchlikeavirus,researchersarereportingtoday.Whenonepersongainsweight,closefriendstendtogainweight,too.Theirstudy,publishedinTheNewEnglandJournalofMedicine,involvedadetailedanalysisofa
2、largesocialnetworkof12,067peoplewhohadbeencloselyfollowedfor32years,from1971to2003.Theinvestigatorsknewwhowasfriendswithwhomaswellaswhowasaspouseorsiblingorneighbor,andtheyknewhowmucheachpersonweighedatvarioustimesoverthreedecades.Thatletthemreconstructwhathappene
3、dovertheyearsasindividualsbecameobese.Didtheirfriendsalsobecomeobese?Didfamilymembers?Orneighbors?Theanswer,theresearchersreport,wasthatpeopleweremostlikelytobecomeobesewhenafriendbecameobese.Thatincreasedapersonschancesorbecomingobeseby57percent.Therewasnoeffectw
4、henaneighborgainedorlostweight，however,andfamilymembershadlessinfluencethanfriends.Itdidnotevenmatterifthefriendwashundredsofmilesaway,theinfluenceremained.Andthegreatestinfluenceofallwasbetweenclosemutualfriends.There,ifonebecameobese,theotherhada171percentincrea
5、sedchanceofbecomingobese,too.Thesameeffectseemedtooccurforweightloss,theinvestigatorssay.Butsincemostpeopleweregaining,notlosing,overthe32years,theresultwas,onaverage,thatpeoplegrewfatter.Dr.NicholasA.Christakis,aphysicianandprofessorofmedicalsociologyatHarvardMed
6、icalSchoolandaprincipalinvestigatorinthenewstudy,saidoneexplanationwasthatfriendsaffectedeachothers’perceptionoffatness.Whenaclosefriendbecomesobese,obesitymaynotlooksobad.“Youchangeyourideaofwhatisanacceptablebodytypebylookingatthepeoplearoundyou,”Dr.Christakissa
7、id.TheinvestigatorssaytheirfindingscanhelpexplainwhyAmericanshavebecomefatterinrecentyears–eachpersonwhobecameobesewaslikelytodragalongsomefriends!club.TopSage.com大家学习网Theiranalysiswasunique,Dr.Christakissaid,becauseitmovedbeyondasimpleanalysisofonepersonandhisorh
8、ersocialcontactsandinsteadexaminedanentiresocialnetworkatonce,lookingathowaperson'sfriend'sfriends,orinfluenceonaperson'sweightoraspouse'ssibling'sfrien
