背景文字阅读.doc

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1、单元背景阅读ThetopfivesuperfoodsathandAllfoodshavesomenutritionalvalue.Buttherearefiveathandthataresobeneficialtoyourhealth—theyareknownas“superfoods”.1.ApplesApplesarefullofvitaminCforhealthyskinandgums—oneappleprovidesaquarterofyourdailyrequirementofvitaminC.Applesalsocontainaformofsoluble

2、(可溶的)fibrecalledpectin(胶质)thatcanhelptolowerbloodcholesterol(胆固醇)levelsandkeepthedigestivesystemhealthy.Anappleisalsoacarbohydrate(碳水化和物)withalowglycaemicindex(GI)type.Theymayhelpwithweightcontrol,aswellasimprovingdiabetics’(糖尿病患者)long-termcontrolofbloodsugarlevels.2.BakedbeansThebaked

3、beanisanutritionalpowerhouseofprotein,fibre,ironandcalcium.Itcontainscarbohydratethat,likethatinapples,isofthelowGIvariety.Theinsolublefibreinbakedbeansisnotdigestedbutmovesintothelargeintestine(肠),wherebacteria(细菌)actonitandproduceshort-chainfattyacids(脂肪酸)whicharethoughttonourishthec

4、olonliningandprotectitfromcancer-causinginvaders(侵略者).3.Salmon(鲑鱼)Allfishisasourceofgood-qualityprotein,vitaminsandminerals,butsalmoncontainsomega3fatsthatreducebloodclotting(凝结)andinflammation(肿痛发炎).Itrescuestheriskofhavingaheartattack,eveninolderadults.Omega3fatsalsohelptopreventdepr

5、ession,andprotectagainsttheonsetofdementia(痴呆).It’struethatfishreallyisanall-roundbrainfood.4.TeaThedrinkishelpfulforstimulatingalertness(机警),moodandmotivation.Teacountstowardseightcupsdailytoavoiddehydration(脱水).Tea,whetherblackorgreen,isarichsourceoftheantioxidant(抗氧化剂)calledcatechin

6、s(儿茶酚)thatprotecttheartery(动脉)wallsagainstthedamagethatcausesheartdiseaseandpreventsformationofstickybloodclots.5.BananasIt’samyththatbananasarefattening.Bananasareslightlyhigherinenergythanotherfruitsandareexcellentforrefuellingbefore,duringorafterexercise.Bananasarealsojam-packedwith

7、potassium(钾)thathelpslowerbloodpressure,andvitaminB6forhealthyskinandhair.