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防晒霜可延缓皮肤光照老化进程最近发表在美国《内科学年鉴》上的一份研究报告指出每天使用防晒霜可延缓皮肤因光照老化的进程同时降低患皮肤癌的风险。Anewstudyhasfoundthatapplyingsunscreeneverydaycandomorethanloweryourriskofskincancer—itcanalsodrasticallyreducetheeffectsofphotoaging(光老化)orthewayfrequentsunexposurecanmakeyourskinlookolder.Andthere'smoregoodnews:Evenifyouslackedoffonsunscreeninyouryouthmiddleageisn'ttoolatetobenefitfromslatheringiton."Ithasbeenasourceoffrustrationforusthatforsomesectionsofthecommunitythesun-safemessagedoesnotseemtobegettingthrough"Dr.AdeleGreenaprofessorattheQueenslandInstituteofMedicalResearchattheUniversityofQueenslandinAustraliasaid."Wenowknowthatprotectingyourselffromskincancerbyusingsunscreenhastheaddedbonusofkeepingyoulookingyoung."ThestudypublishedthisweekintheAnnalsofInternalMedicinealsolookedatwhethertakingbeta-carotenesupplementscouldhaveananti-agingeffect.Beta-caroteneisatypeofantioxidantknownasacarotenoid(类胡萝卜素)andhasbeenlinkedtoareducedriskofskincancer.Fortherandomized-controlledtrialtheresearchersassigned903participantstooneoffourgroups:Thosewhousedbroad-spectrumsunscreensdailyandtake30milligramsofbeta-carotenethosewhouseddailysunscreenandtookaplacebothosewhotookthebeta-carotenebutonlyusedsunscreenperiodicallyandthosewhousedsunscreenperiodicallyandtookaplacebo.(Allparticipantswereage55oryounger;theresearchersdecideditwouldnotbeethicaltohaveagroupinwhichparticipantsusednosunscreenatall.)[来源:1]ThetwodailysunscreengroupsusedUVA/UVBblockingproductswithaSPF(sunprotectionfactor)of15orhigher;theyappliedtheproducttotheirheadneckarmsandhandseachmorningafterbathingandreappliediteveryfewhours.Theothertwogroupsappliedsunscreenwhereandwhentheythoughttheyneededit.Theresearcherstrackedparticipantsfor