大学英语3--期末考精彩试题--阅读题题库急加DA-AN
摘要:标准第一次Whydosmokerstendtoweighlessthannonsmokersandgainweightwhentheygiveupthehabit?Contraryto“commonknowledge”,nonsmokersdonotgenerallyeatmorethansmokers,nordotheyexerciseless,studiesfind.Researchperformedonsmokersatrestindicatesthatnicotine(尼古丁)itselfcanincreasebasalmetabolic(新陈代谢的)rates,meaningsmokersburnmoreenergythannonsmokersduringperiodsofinactivity.Butsurveyssuggestmostsmokerssmokenotwhilecompletelyatrest,butwhileperforminglightactivitiessuchasdeskworkthatcanincreasemetabolicratesbytwoorthreetimes.Unlessnicotine’smetaboliceffectsincreaseproportionallywithmetabolicrates,itsinfluenceonweightmightbeinsignificant.Nowastudyshowsthatnicotine’seffectsonbody-fuelconsumptionindeedin
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