考研英语阅读例题：Doeslightmakeyoufat灯光会使你变胖吗

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1、Doeslightmakeyoufat?灯光会使你变胖吗？[2010.10.14]TheEconomistTHEblameforrisingobesityrateshasbeenpinnedonmanythings,includingamorecalorificdiet,thespreadofprocessedfood,alackofexerciseandmodernman'sgenerallymorestressfullot.Somethingelsemaysoonbeincludedinthelist:brighternights.Lightregulatesthebody'sbio

2、logicalclock—priminganindividuafsmetabolismforpredictableeventssuchasmealsandslumber.Previousresearchhasshownthat,inmiceatleast,thegenesresponsibleforthiscanbemanipulatedsoastomaketheanimalsplumperandmoresusceptibletoproblemsassociatedwithobesity，includingdiabetesandheartdisease.Itwasnotknown,tho

3、ugh,whethersimplyalteringambientlightintensitymighthavesimilareffects.AteamofresearchersledbyLauraFonkenofOhioStateUniversityhasclearedthematterup.AstheyreportintheProceedingsoftheNationalAcademyofSciences,theyexaminedhownocturnallightaffectsweight，bodyfatandglucoseintolerance(theunderlyingcauseo

4、flatc-onsctdiabetes)inmalemice.Theyfoundthatpersistentexposuretoevenalittlenight-timelightleadstoincreasesinallthree・ToreachthisconclusionDrFonkensplithermurinesubjectsintothreegroups.Somewerekeptincageslitconstantly,soastoresembleanever-endingovercastday・Asecondgrouplivedinconditionsakintotheirn

5、aturalhabitat,with16hoursofovercastday-likelight,followedbyeighthoursofdarkness.Theremainingrodentswerealsoexposedtoacycle,butthedarkwasreplacedwithadimglowequivalenttothetwilightatthefirstflickersofdawn.Overthecight-wcckperiodoftheexperimentthemiceinthefirstandthirdgroupsgainedalmost50%moreweigh

6、tthanthoseexposedtothenaturallight-darkcycle.Theyalsoputonmorefatandexhibitedreducedtoleranceofglucose,despiteeatingcomparableamountsoffoodandmovingaroundjustasmuch・Inafollow-upexperiment,DrFonkenlookedatwhetherthetimingoffoodconsumptionalonecouldexplaintheobserveddifferences・Itturnedoutthatthose

7、forcedtoeatduringthe"day"—ie,outofwhackwiththeirbiologicalclock一didindeedgainabout10%moreweightthanthosefedat“night"(beitdarkorjustdim)orthosewithuninterruptedaccesstogrub・Howthismightrelatetopeoplewillrequirefurtherin