为什么演讲稿范文3篇Word格式文档下载.docx
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为什么演讲稿范文3篇Word格式文档下载.docx
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在美国,80%的女孩在她们10岁的时候便开始节食。
神经学家sandraaamodt结合自己的亲身经历,讲述大脑是如何控制我们的身体的。
节食减肥为何没效果?
来听听她的说法吧!
threeandahafyearsago,imadeoneofthebestdecisionsofmyife.asmynewyear’sresoution,igaveupdieting,stoppedworryingaboutmyweight,andearnedtoeatmindfuy.nowieatwheneveri’mhungry,andi’veost10pounds.
thiswasmeatage,whenistartedmyfirstdiet.iookatthatpicturenow,andithink,youdidnotneedadiet,youneededafashionconsut.(aughter)butithoughtineededtooseweight,andwhenigaineditback,ofcourseibamedmysef.andforthenextthreedecades,iwasonandoffvariousdiets.nomatterwhatitried,theweighti’dostawayscameback.i’msuremanyofyouknowthefeeing.
asaneuroscientist,iwondered,whyisthissohard?
obviousy,howmuchyouweighdependsonhowmuchyoueatandhowmuchenergyyouburn.whatmostpeopedon’treaieisthathungerandenergyusearecontroedbythebrain,mostywithoutyourawareness.yourbraindoesaotofitsworkbehindthescenes,andthatisagoodthing,becauseyourconsciousmind--howdoweputthispoitey?
--it’seasiydistracted.it’sgoodthatyoudon’thavetoremembertobreathewhenyougetcaughtupinamovie.youdon’tforgethowtowakbecauseyou’rethinkingaboutwhattohavefordinner.
yourbrainasohasitsownsenseofwhatyoushoudweigh,nomatterwhatyouconsciousybeieve.thisiscaedyoursetpoint,butthat’samiseadingterm,becauseit’sactuayarangeofabout10or15pounds.youcanuseifestyechoicestomoveyourweightupanddownwithinthatrange,butit’smuch,muchhardertostayoutsideofit.thehypothaamus,thepartofthebrainthatreguatesbodyweight,therearemorethanadoenchemicasignasinthebrainthatteyourbodytogainweight,morethananotherdoenthatteyourbodytooseit,andthesystemworksikeathermostat,respondingtosignasfromthebodybyadjustinghunger,activityandmetaboism,tokeepyourweightstabeasconditionschange.that’swhatathermostatdoes,right?
itkeepsthetemperatureinyourhousethesameastheweatherchangesoutside.nowyoucantrytochangethetemperatureinyourhousebyopeningawindowinthewinter,butthat’snotgoingtochangethesettingonthethermostat,whichwirespondbykickingonthefurnacetowarmthepacebackup.
yourbrainworksexactythesameway,respondingtoweightossbyusingpowerfutoostopushyourbodybacktowhatitconsidersnorma.ifyouoseaotofweight,yourbrainreactsasifyouwerestarving,andwhetheryoustartedoutfatorthin,yourbrain’sresponseisexactythesame.wewoudovetothinkthatyourbraincoudtewhetheryouneedtooseweightornot,butitcan’t.ifyoudooseaotofweight,youbecomehungry,andyourmuscesburnessenergy.dr.rudyeibeofcoumbiauniversityhasfoundthatpeopewhohaveost10percentoftheirbodyweightburn250to400caoriesessbecausetheirmetaboismissuppressed.that’saotoffood.thismeansthatasuccessfudietermusteatthismuchessforeverthansomeoneofthesameweightwhohasawaysbeenthin.
fromanevoutionaryperspective,yourbody’sresistancetoweightossmakessense.whenfoodwasscarce,ourancestors’survivadependedonconservingenergy,andregainingtheweightwhenfoodwasavaiabewoudhaveprotectedthemagainstthenextshortage.overthecourseofhumanhistory,starvationhasbeenamuchbiggerprobemthanovereating.thismayexpainaverysadfact:
setpointscangoup,buttheyrareygodown.now,ifyourmotherevermentionedthatifeisnotfair,thisisthekindofthingshewastakingabout.(aughter)successfudietingdoesn’toweryoursetpoint.evenafteryou’vekepttheweightoffforasongassevenyears,yourbrainkeepstryingtomakeyougainitback.ifthatweightosshadbeenduetoaongfamine,thatwoudbeasensiberesponse.inourmodernwordofdrive-thruburgers,it’snotworkingoutsoweformanyofus.thatdifferencebetweenourancestrapastandourabundantpresentisthereasonthatdr.yonifreedhoffoftheuniversityofottawawoudiketotakesomeofhispatientsbacktoatimewhenfoodwasessavaiabe,andit’sasothereasonthatchangingthefoodenvironmentisreaygoingtobethemosteffectivesoutiontoobesity.
sady,atemporaryweightgaincanbecomepermanent.ifyoustayatahighweightfortooong,probabyamatterofyearsformostofus,yourbrainmaydecidethatthat’sthenewnorma.
psychoogistscassifyeatersintotwogroups,thosewhoreyontheirhungerandthosewhotrytocontrotheireatingthroughwipower,ikemostdieters.et’scathemintuitiveeatersandcontroedeaters.theinterestingthingisthatintuitiveeatersareessikeytobeoverweight,andtheyspendesstimethinkingaboutfood.controedeatersaremorevunerabetoovereatinginresponsetoadvertising,super-siing,andthea-you-can-eatbuffet.andasmaindugence,ikeeatingonescoopoficecream,ismoreikeytoeadtoafoodbingeincontroedeaters.chidrenareespeciayvunerabetothiscyceofdietingandthenbinging.
severaong-termstudieshaveshownthatgirswhodietintheirearyteenageyearsarethreetimesmoreikeytobecomeoverweightfiveyearsater,eveniftheystartedatanormaweight,andaofthesestudiesfoundthatthesamefactorsthatpredictedweightgainasopredictedthedeveopmentofeatingdisorders.theotherfactor,bytheway,thoseofyouwhoareparents,wasbeingteasedbyfamiymembersabouttheirweight.sodon’tdothat.(aughter)
ieftamostamygraphsathome,buticoudn’tresistthrowinginjustthisone,becausei’mageek,andthat’showiro.(aughter)thisisastudythatookedattheriskofdeathovera14-yearperiodbasedonfourheathyhabits:
eatingenoughfruitsandvegetabes,exercisethreetimesaweek,notsmoking,anddrinkinginmoderation.et’sstartbyookingatthenormaweightpeopeinthestudy.theheightofthebarsistheriskofdeath,
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