iron deficiency

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1、1请大家课前认真阅读以下有关课文背景的知识。（将生词找出，并查字典）2预习课文及单词，完成课后练习III和IV(p.36-38)IRONDEFICIENCYWhatisirondeficiency?Ironisamineralfoundineverycellofthebody.Itisvitalforgoodhealthandforourmentalandphysicalwellbeing.Lackofironisthemostcommonsinglenutrientdeficiencyworldwide,withwomenandpreschoolchildrenbeingatp

2、articularrisk.However,correctinganirondeficiencyisusuallystraightforward.WhydoIneediron?Ironisoneof20mineralsfoundinfood.Itisstoredinyourliver,spleenandbonemarrow.Ifyourbodylacksiron,itcannotmakeenoughhaemoglobin,whichisthesubstanceinyourredbloodcellsthatcarriesoxygentothebodyandbrain.Ironboo

3、stsyourimmunesystem,helpingfightinfections,andisvitalfornormalgrowthandintellectualdevelopmentinchildren.Ifyoudonothaveenough,youmaylackenergyandgetsickoften.Ironisalsoneededforoptimumbrainfunctioninadults.Whoisatrisk?Youmaydevelopirondeficiencyifyoudonoteatiron-richfoodsforalongperiodoftime.

4、Peopleneedmoreironatcertaintimes,suchasinadolescence,pregnancyorwhenexercisingalot.Irondeficiencycanbeduetolengthyillnessorlosingbloodfromheavyperiodsorstomachulcers–bleedingfromsomecancersisararebutimportantcause.Yourdoctorcancheckyouhavenoseriouscausefordeficiency.Drugs(eg,aspirinandsomeant

5、i-inflammatories)canalsocausebleedinginthegut.GirlsandwomenWomenneedmoreironbecauseofbloodlossduringtheirperiods.Theyalsoneedmorethandoubletheusualintakeofironduringpregnancy.Women(ormen)whofollowrestrictiveorfaddietscanbecomeirondeficient.InfantsandyoungchildrenIrondeficiencyisextremelycommo

6、ninpreschoolchildreninNewZealand,withuptoaquarterofthoseunderthreeyearsofagesufferingfromiron-deficiencyanaemia.Thiscanhaveapermanentimpactonbraindevelopment,makingsuchchildrenlessabletolearn.Iron-deficientyoungstersmayalsonotgainenoughweight,haveproblemswithfeedinganddigestion,gettiredeasily

7、andbemorepronetoinfectionsandillness.Childrenbetweensixand24monthsareatgreatestrisk.TeenagersTeenagersneedextranutrientstofuelgrowthspurts,buttheyarealsomorelikelytohaveapoordiet.AthletesIronislostthroughexcessivesweatingandsomeathletes(parti