【阅读理解Youngeradultswhogeteitherlittlesleeporalotofitmayseeagreaterexpansionintheirwaistlines(腰围)overtimeastudypublishedsuggests．Researchersfoundthatamongblac】

　　阅读理解

　　Youngeradultswhogeteitherlittlesleeporalotofitmayseeagreaterexpansionintheirwaistlines(腰围)overtimeastudypublishedsuggests．ResearchersfoundthatamongblackandHispanicadultsyoungerthan40thosewhotypicallysleptforfivehoursorlesseachnighthadagreateraccumulationofbellyfatoverthenextfiveyearsversus(相比于)thosewhoaveragedsixorsevenhours．Thosewhoslepteighthoursormoreinbedeachnightalsoshowedabiggerfatgain-butitwaslessobviousthanthatseenin“shortsleepers．”

　　ThestudyreportedintheJournalSleepdoesnotprovethattoolittleortoomuchsleepdirectlyleadstoexcessfatgain．Butthefindingssupportandextendthoseofotherstudieslinkingsleepduration-particularlyalackofsleep-toweightgainandeventohigherrisksofdiabetes(糖尿病)andheartdisease．Amongparticipantsyoungerthan40thestudyfoundthosewhosaidtheysleptforfivehoursorlesseachnightgainedmorebellyfatthanthosewhoaveragedsixorsevenhoursofsleep．Onaverageshortsleepersshoweda32percentgaininvisceral(内脏的)fatversusa13percentgainamongthosewhosleptsixorsevenhourspernightanda22percentincreaseamongmenandwomenwhogotatleasteighthoursofsleepeachnight．Asimilarpatternwasseenwithsuperficialabdominal(腹部)fat．

　　ThefindingsaccordingtoleadresearcherDr.KristenG.Hairstonsupportthebeliefthatsleephabitsaffectweightandhealthingeneral．“Sleepisanimportantpartofyouroverallhealth-notjustinwhetheryou'retiredduringtheday”shesaid．

　　Theremaybeindirecteffects;peoplewhogettoolittlesleepmaybetootiredduringthedaytoexercisewhilethosewhospendalotoftimeinbedmayspendlesstimebeingactiverelativetopeoplewhosleepfewerhours．Researchalsosuggeststhatsleeplossalterspeople'slevelsofappetite-regulatinghormones(荷尔蒙)-whichcouldintheorycausethemtoovereat．Depressionwhichoftenaffectspeople'ssleepandhasbeenlinkedtoweightgaincouldalsobeafactorHairstonnoted．

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