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CHEM 115 (2)
Lecture

world of chem: food

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Department
Chemistry
Course
CHEM 115
Professor
Joe Schwarcz
Semester
Winter

Description
WorldofChemistryFoodCHEM150Lecture7February172009LecturegivenbyDrHarppLectureTopicCancer Thenamecancercomesfromthezodiacalsignofcancero Thisisbecausetumorsarehardlikethesymbolforcancerthecrab Theyalsohavegrowthsonthesidelikethecrabhaslegs Thecrabisalsoaconstellation Gettingdataoncancerisnotsoeasybecauseitdependsonthecountryandhowtheydefinemanyfactors Itisnotunusualtogetcancernumbersforpreviousyearssinceittakestimetoaccumulatethosenumbersforalargepopulation Twoyearsagoforthefirsttimein7decadescancerdeathsfello Itonlywentdownbyafewhundreddeathsperyearbutthisisstillgoodnewsespeciallysinceitisforourincreasingpopulation Smokingisonthedeclinewithabout4550ofpeoplesmokingaroundWorldWarIItoabout20now IntheUnitedStatesabouthalfamillionhavecancerandaboutatenthofthatinCanada50000 ThelowestcancercasesontheComparisonofCancerIncidenceslideshowninclassisHodgkinsdiseaseinJapanwhereasthecancerwiththehighestnumberofcasesisoftheProstateintheUSo Theactualnumbersonthisslidearenotimportanttheimportantthingtotakehomefromthisisthatcancerratesvarygreatlyfromcountrytocountry Indiatendstohavethelowestcancerrate Thisismostlikelygreatlyduetodifferencesindietloweramountsofmeatfattyfoodsandloweramountsofsugar Notesugardoesnotcausecancerbutleadstoincreaseinweightwhichincreasesriskofcancer UScancerratesarediminishingforallracesandbothsexes Mostcancersareinfactdiminishingbutlungcancerisstillontheincreasemainlyforwomenbecausetheyhavestartedtosmokeasmuchasmen2530yearsagoo Menwhohaveasawholebeensmokinglongerthanwomenhavestartedtoquitsmokingandtheirlungcancerratesaredropping Stomachcancerisgoingdowno ItisparticularlyhighinJapan Prostatecancerisalsodiminishingasisstomachcancer Thereisa12peryearreductiononcolorectalcancero Todeterminehowlongitwilltakeforthetotalnumbertobehalfordoubleofwhatitistodaydividethenumber70bytheo Inthiscase70dividedby1equals70meaningitwouldtake70yearsatthisratefortheretobehalfasmanycolorectalcancercases Melanomasskincancerareincreasingforpeopleagedunder65especiallyinAustraliawheretheygetverydirectsuno Theylooklikeirregularlyshapedprotrusionsontheskinandcanbemulticoloredo Theseareverydangerous Lungcancerforwomenovertheageof65hadincreasedby250between1973and1994o Manycancersforpeopleovertheageof65havegoneupmainlyduetothefactthatwenowlivelongerthanweusedtoincreasingtheriskofdevelopingacancer IntheUSoverhalfamillionwilldieofcancerthisyearthisisabout1500peopleperdaytho About110ofthisisthenumberofpeoplewhowilldieofcancerinCanadathisyear InNorthAmericathemostfrequentcancersarelungbreastprostateandcolon RiskfactorprevalenceintheUSo Cigarettesmokingthisisgoingdown Cancerisactuallynotthebiggestthreattosmokersitisinsteadheartdisease2wwwwocntccom
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