为什么演讲稿3篇.docVIP

为什么演讲稿3篇 为什么演讲稿3篇简介在美国，*%的女孩在她们10岁的时候便开始节食。 神经学家sandra aamodt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!three and a halfyears ago,i madeone of the bestdecisions ofmy life.as mynew yearsresolution,i gaveup dieting,stopped worryingabout myweight,and learnedto eatmindfully.now ieat wheneverim hungry,and ivelost10pounds.this wasme at age13,when istarted myfirst diet.i look at thatpicture now,and i think,you didnot needa diet,you neededa fashionconsult.(laughter)but ithought ineeded to lose weight,and when i gainedit back,of coursei blamedmyself.and for the ne*t threedecades,i wason andoff variousdiets.no matterwhat itried,the weightid lostalways cameback.im suremany ofyou knowthe feeling.as aneuroscientist,i wondered,why isthis sohard?obviously,how muchyou weighdepends onhow muchyou eat and howmuch energyyou burn.what most people dontrealize is that hungerand energyuse arecontrolled by the brain,mostly withoutyour awareness.your braindoes a lot ofits workbehind thescenes,and that is agood thing,because yourconscious mind-how dowe putthis politely?-its easilydistracted.its goodthat you dont haveto rememberto breathewhen youget caughtup in a movie.you dontforget howto walkbecause yourethinking aboutwhat tohave fordinner.your brain also hasits ownsense ofwhat you should weigh,no matterwhat youconsciously believe.this iscalled your set point,but thats a misleadingterm,because itsactually arange ofabout10or15pounds.you canuse lifestylechoices tomove your weight upand downwithin thatrange,but itsmuch,much harderto stayoutside ofit.the hypothalamus,the partof thebrain thatregulates bodyweight,there are more thana dozenchemical signalsin thebrain that tell your body to gain weight,more thananother dozenthattellyour bodyto loseit,and the system workslike a thermostat,responding tosignals from the bodyby adjustinghunger,activity andmetabolism,to keepyourweightstable asconditions change.thats whatathermostatdoes,right?it keepsthe temperaturein yourhouse thesame asthe weatherchanges outside.now you can tryto changethe temperaturein yourhouse byopening awindow in the winter,but thatsnot going to changethe settingon thethermostat,which willrespond bykicking on the furnaceto warmthe placeback up.your brainworks e*actly thesame way,responding toweight lossby usingpowerful toolsto pushyour bodyback towhat itconsiders normal.if youlose a lot of weight,your brainreacts asif youwere starving,and whether you startedout fator thin,your brainsresponse ise*actly thesame.we wouldlove tothink thatyour braincould tellwhetheryouneed tolose weightor not,but itcant.if you do losea lot ofweight,you beehungry,and yourmuscles burnless energy.dr.rudy leibelof columbiauniversity hasfound thatpeople whohave lost10percent of their bodyweight burn250to400calories lessbecause theirmetabolism issuppressed.thatsa lot offood.this meansthat asuessful dietermust eatthis muchless foreverthan someoneof thesame weightwho hasalways beenthin.from anevolutionary perspective,your bodysresistance toweight lossmakes sense.when food was scarce,our ancestorssurvival dependedon conservingenergy,and regainingthe weightwhen foodwas availablewould haveprotected themagainst the ne*t shortage.over thecourse ofhuman history,starvation hasbeen amuch biggerproblem thanovereating.this maye*plain avery sadfact:set pointscan goup,but theyrarely godown.now,if yourmother evermentioned thatlife isnot fair,this is the kindof thingshe wastalking about.(laughter)suessful dietingdoesnt loweryoursetpoint.even afteryouve keptthe weightoff for as longas sevenyears,your brainkeeps tryingto make you gainit back.if thatweight losshad beendue to a longfamine,that wouldbe asensible response.in ourmodern worldof drive-thru burgers,its notworking outso wellfor many of us.that differencebetween ourancestral pastand ourabundant presentis thereason thatdr.yoni freedhoffof theuniversity ofottawa wouldlike totake someof hispatients backto atime whenfoodwasless available,and its also thereason thatchanging thefood environmentis reallygoingto be themost effectivesolution toobesity.sadly,a temporaryweight gaincan beepermanent.if youstay ata highweight fortoo long,probably amatter ofyears formost ofus,your brainmay decidethat thatsthe newnormal.psychologists classifyeaters intotwo groups,those whorely ontheir hungerand thosewho tryto controltheir eatingthrough willpower,like mostdieters.lets callthem intuitiveeaters andcontrolled eaters.the interestingthing isthat intuitiveeaters areless likely tobeoverweight,and theyspend lesstime thinkingabout food.controlled eatersaremorevulnerable toovereating inresponse toadvertising,super-sizing,and theall-you-can-eat buffet.andasmall indulgence,like eatingone scoopof icecream,is more likelytolead toa foodbinge incontrolled eaters.children areespecially vulnerableto thiscycle ofdieting and then binging.several long-term studieshave shownthat girlswho dietin theirearly teenageyears arethree timesmore likelyto beeoverweight five years later,even ifthey startedatanormal weight,and allof thesestudies foundthat thesame factorsthat predictedweight gainalso predictedthe developmentof eating disorders.the otherfactor,by theway,those ofyou whoare parents,was beingteased byfamily membersabout theirweight.so dontdo that.(laughter)i leftalmost allmy graphsat home,but icouldnt resistthrowing injust thisone,because ima geek,and thatshow iroll.(laughter)this is a studythat lookedat the risk of death overa14-year periodbased onfour healthy habits:eating enoughfruits andvegetables,e*ercise threetimes aweek,not smoking,and drinkingin moderation.lets startby lookingat the normal weightpeople in the study.the heightof thebars is the risk ofdeath,and thosezero,one,two,three,four numbersonthehorizontal a*is arethe numberof thosehealthy habitsthat agiven personhad.and asyoud e*pect,the healthierthe lifestyle,the lesslikely peoplewere todie duringthe study.now letslookatwhat happensin overweight people.the onesthat hadno healthyhabits hada higherriskofdeath.adding justone healthyhabit pullsoverweightpeopleback intothenormalrange.for obesepeople withno healthyhabits,theriskis veryhigh,seven timeshigher thanthe healthiestgroups in the study.but ahealthy lifestylehelps obesepeople too.in fact,if youlook onlyat thegroup withall fourhealthyhabits,you cansee thatweight makesvery littledifference.youcantake controlof yourhealth bytaking controlof yourlifestyle,even if you cantlose weightand keepit off.diets donthave verymuch reliability.fiveyearsafter a diet,mostpeoplehave regainedthe weight.forty percent of themhave gainedeven more.ifyouthink aboutthis,the typicaloute ofdieting isthat youremorelikelytogainweight in the longrun thantoloseit.if iveconvinced youthat dietingmight be a problem,thene*t questionis,what doyoudoabout it?and myanswer,ina word,is mindfulness.im notsaying youneed tolearn tomeditate ortake upyoga.im talkingabout mindfuleating:learning tounderstand yourbodys signalsso thatyou eat when yourehungry andstop when youre full,because alot ofweight gainboils downto eatingwhen yourenot hungry.how doyoudoit?give yourselfpermission toeat asmuch asyou want,and thenwork onfiguring outwhat makesyourbodyfeel good.sit downto regularmeals withoutdistractions.think abouthow yourbody feelswhen youstart toeatand whenyoustop,and letyour hungerdecide whenyoushouldbe done.it tookabout ayear forme tolearn this,but itsreally beenworth it.i amso muchmore rela*ed aroundfood thani haveever beenin mylife.i oftendont thinkabout it.i forgetwe havechocolate inthe house.its likealiens havetaken overmy brain.its justpletely different.i shouldsay thatthis approachto eatingprobably wontmakeyoulose weightunless youoften eatwhen yourenot hungry,but doctorsdont knowof anyapproach thatmakes significantweight lossinalotof people,and thatis whyalotofpeopleare nowfocusing onpreventing weightgain instead of promotingweight loss.lets faceit:if dietsworked,wed allbe thinalready.(laughter)why dowe keepdoing thesame thingand e*pecting differentresults?diets mayseem harmless,but theyactually doalotof collateraldamage.at worst,they ruinlives:weight obsessionleads toeatingdisorders,especially inyoung heu.s.,we have80percentof10-year-old girlssay theyvebeen onadiet.our daughtershave learnedto measuretheir worthby thewrong scale.even atits best,dieting isa wasteof timeand energy.it takeswillpower whichyou couldbe usingto helpyour kidswith theirhomework orto finishthat importantwork project,and becausewillpower islimited,any strategythat relieson itsconsistent applicationis prettymuch guaranteedto eventuallyfail youwhen yourattention moveson tosomething else.let meleave youwith onelast thought.what ifwe toldall thosedieting girlsthat itsokay toeatwhentheyre hungry?what ifwe taughtthem towork with their appetiteinsteadoffearing it?ithinkmost of them wouldbe happierand healthier,and asadults,manyof them wouldprobably bethinner.i wishsomeone hadtold methat backwheniwas13.thanks.(applause)i havethe answertoaquestion thatweve allasked.the questionis,why isit thatthe letter*represents the unknown?now iknow welearned thatin mathclass,but nowits everywhereintheculture-the*prize,the*-files,project*,ted*.whered thate from?about si*years agoi decidedthatiwould learnarabic,which turnsout tobeasupremely logicallanguage.to writeawordoraphrase ora sentencein arabicis likecrafting anequation,because everypart ise*tremely preciseand carriesalotof information.thats oneofthereasons somuch ofwhat wevee tothink ofas westernscience andmathematics andengineering wasreally workedout inthe firstfew centuriesofthemon eraby thepersians andthe arabsandtheturks.this includesthe littlesystem inarabic calledal-jebra.and al-jebr roughlytranslates tothesystemfor reconcilingdisparate parts.al-jebr finallycame intoenglish asalgebra.one e*ample amongmany.the arabicte*ts containingthis mathematicalwisdom finallymade theirway toeurope-which isto sayspain-inthe11th and12th centuries.andwhenthey arrivedthere wastremendous interestin translatingthis wisdominto aeuropean language.but therewere problems.one problemis thereare somesounds inarabic thatjust dontmake itthrough aeuropean voicebo*without lotsof practice.trust meon thatone.also,those verysounds tendnot tobe representedbythecharacters thatare availablein europeanlanguages.heres oneoftheculprits.this isthe lettersheen,and itmakes thesound wethink ofas sh-sh.itsalsothe veryfirst letterofthe word shalan,which meanssomething justlike thethe englishword something-some undefined,unknown thing.now inarabic,we canmake thisdefinite byadding thedefinite articleal.so thisis al-shalan-theunknownthing.and thisisaword thatappears throughoutearly mathematics,such asthis10th centuryderivation ofproofs.the problemforthemedieval spanishscholars whowere taskedwith translatingthis materialisthatthe lettersheen andthewordshalan cantbe renderedinto spanishbecause spanishdoesnt havethat sh,that shsound.so byconvention,they createda rulein whichthey borrowedthe ck sound,cksound,fromtheclassical greekintheform ofthe letterkai.later whenthis material was translatedinto amon europeanlanguage,which isto saylatin,they simplyreplaced thegreek kaiwiththelatin*.and oncethat happened,once thismaterialwasin latin,it formedthe basisfor mathematicste*tbooks foralmost600years.but nowwe havethe answerto ourquestion.why isit that*istheunknown?*istheunknown becauseyou cantsay shin spanish.(laughter)and ithought thatwas worthsharing.(applause)尊敬的各位老师，同学们，大家好！我是法学院大四学生李明，我演讲的题目是我为什么要学法律很多人听到这个题目，一定以为我太把这次演讲比赛当做儿戏了。 一个简单的专业选择的问题，与我们今天的主题“中国梦”能有多大的关联呢？其实在初入燕园之时，我也只曾在大众媒体和长辈的口耳相传中听得法律职业者的种种评价，也只曾知道“宪法是我国根本大法”之类的政治课本知识，也只曾在路过国徽高悬的庄严肃穆的法院门口时好奇的回望。 而今，我即将从北大法学院毕业，成为一名光荣的北大法律人，我所应当肩负的责任是什么，我可能实现的人生价值在历史的坐标下又是什么？我想，这个简单的问题，不仅仅是我四年燕园求学中努力求索的精神真谛，而且将是指导我未来发展的永恒旗帜。 法律人，应该有着怎样的中国梦，这需要我们用整个人生去回答。 法律人的中国梦，是维护公民合法利益的权利之梦。 法治，绝不应当仅仅是宏大的制度构建，而也应当构筑起公民权利的堡垒，让苦干多年农民工兄弟早日拿到血汗钱，让征地拆迁中的血案不再上演，让猖獗一时的刑讯逼供无处藏身。 法学家耶林告诉我们，要“为权利而斗争”，因为当每个人都在强权面前退却的时候，整个共同体的利益将不得不被放弃。 法律人站在公民权利与强权暴力交锋的战场，捍卫每个人的权利，捍卫每个人的中国梦。 法律人的中国梦，是追求社会公平的正义之梦。 坚韧的法律人，让苍南县政府做到了被告席上，与浙江普通农民包郑照对簿公堂。 执着的法律人，让佘祥林、赵作海获得了他们应得的国家赔偿，使冤案昭雪，真相大白。 让比太阳还要光辉的公平正义洒满人间，是法律人永恒