Scientistshavediscoveredthat（61）___（stay）inthecoldcouldhelpusloseweight．ResearchersattheUniversityofCaliforniafoundthatexposuretothecoldincreaseslevelsofaproteinthathelpsformbrownfat--thetypeoffatthatproducesheatandkeepsuswarm．Brownfatburnsenergy，（62）___helpsusloseweight．Whitefatstoresextraenergy，whichresults（63）___ weightgain．Theresearcherssaidthatbecauseairconditioningandheatinggiveusconstant，（64）___（comfort）temperatures，ourbody'sneedforbrownfathasdecreased．Theyfoundthat："OutdoorworkersinnorthernFinlandwho（65）___（expose）tocoldtemperaturehave （66）___significantamountofbrownfatwhen67）___（compare）tosame-agedindoorworkers．"Theresearchwasconductedontwodifferentcontrolgroupsofmice．（68）___groupwasinjectedwiththeproteinthathelpscreatebrownfat．Thisgrouplatergained30%lessweightafterbothgroupswerefedhigh-fatdiets．Theresearcherssaythiscouldbegoodnewsinthefightagainstobesity．Peoplewhoareobesehave（69）___（low）levelsofbrownfatthanthinnerpeople．HeadresearcherHeiSookSulsaid，"Thisproteincouldbecomeanimportanttargetforresearchintothetreatmentandpreventionofobesityandobesity-relateddiseases．"Sheadded，"Ifyoucansomehowincreaselevelsofthisprotein，youcould（70）___（possible）losemoreweightevenifeatingthesameamountoffood．"