为什么演讲稿范文3篇.docx

为什么演讲稿范文3篇.docx

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为什么演讲稿范文3篇

为什么演讲稿范文3篇

简介：

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,