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1、WhatisGMfood?TalkaboutthebenefitsandrisksofGMfood.GMfoods,socalledgeneticallymodifiedfoods,arethefoodsthatarederivedfromgeneticallymodifiedorganisms.GeneticallymodifiedorganismshavehadspecificchangesintroducedintotheirDNAbygeneticengineeringtechniques.GMtechnologyistheseparationanddecoratedart
2、ificialgenesintothegenomeoforganisms,andtogeneexpression,accesstonewtraitsofbiologicaltechnology.Sincethistechnologywaspracticed,geneticallymodifiedfoodhasdevelopedalot.In1983,world’sfirstcaseofsuccessfulcultivationistobacco.In1994,theU.S.firstcaseofGMfoodistomatoes.In1996,large-scaleproductio
3、nhascomeintouse.Sincethat,theamountofGMfoodsincreasedby52timeseachyear.Peoplehavesharedalotofadvantagesastimewentby.GMcropsaremoreproductiveandhavealargeryield.Theycanoffermorenutritionalvalueandbetterflavor.Whatismore,apossibilitythattheycouldeliminateallergy-causingpropertiesinsomefoodsandin
4、builtresistancetopests,weedsanddisease.Theyarealsomorecapableofthrivinginregionswithpoorsoiloradverseclimatesandremainingfreshlonger.Still,atthesametime,muchdangerhasbeenputupalltheway.Forexample,inAugust1998,aBritishresearchinstitutereportedthatratsateGMpotatoes,whichwasinsect-resistanttransg
5、enicpotatoesproducedbysnowdroplectin.Andtherewasdamagetointernalorgansandimmunesystemsandthisimpededthegrowthofmice.Apartfromwhatwehavementionedabove,geneticallymodifiedfoodshasalsoexertedinfluenceonthepossibleimpactofhumanconsumptionandmayaffecttheecologicalenvironment,suchassuperweedproblems
6、,theimpactofbiodiversityanddestructionofecologicalbalance.Whatismoreserious,GMcropsmayexpandto“geneticpollution”,whichmightdestroythebiodiversity,leadingtoextinctionofindividualspecies,affectthehiddendangersofbiologicaldiversityandGMfoodshaveyettoappeardirectlyharmfultohumancases.Inmyopinion,t
7、hebenefitsoutweighthepotentialrisks.Oneonehand,trustinfoodsafetyandregulatorysystems.Ontheotherhand,watchoutthefurthersafetyevaluationandriskassessment.
