（冀教版）三年级英语下册课外拓展Unit1foodandmorenumbersLesson1I’mHungry!FishandhealthSeafoodtakeaprimeroleinChinesefeast.Chineseisgoodatcookingfish,canmakeitverydeliciousandcontainlesscookingoil.ForfishtomaintainfluidityincoldwatersuchasAlaska,theirfatshavetoremainliquid.Fishoilrichinomega-3fattyacids.Thetwoomega-3'sinfishareeicosapentaenoicacid(EPA)anddocosahexaenoicacids(DHA).EPAandDHAareessentialforhumanhealth,DHAit'scriticaltodevelopmentofthebrainandretinaforinfant,thehumanbreastmilkcontainit.EPAandDHAareverybenefittheheartandbloodvessels.Inonestudypeopleeatfourtimesofatleastthreeouncesalmonamonthreduced50percentriskofcardiacarrest.StudyshowEPAandDHAcaninhibitthesynthesisofsubstancesthatresultinflammationandbloodclots,stabilizetheelectricalactivityoftheheart.Lowerbloodpressure,triglyceridelevelsandimprovethefunctioningofarterylinings.Althoughhumancanconvertalpha-linolenicacid(ALA)toEPAandDHA,theconversionrateissolow,youneedeatalotoffoodcontainALA,that'smakeitimpractical.Eatingfishisagoodwaytoreachhealth.Astheworldgetmorepollution,thefishalsomaybecomedangeroustoyourhealth.Mercuryisacommontoxin,becautious,especiallytopregnantwomen,tosomedeepseafishwhicheatotherfishandresultaccumulatemoremercuryintheirbody.Suchastilefish,swordfish,shark,kingmackerel.Alsoavoidfishcomesfromsomelocationorareawhichareheavenlypolluted.用心爱心专心1
