研究：夜间室外光照易提高患乳腺癌的风险
<p><span word="Women">Women</span> <span word="who">who</span> <span word="live">live</span> <span word="in">in</span> <span word="areas">areas</span> <span word="with">with</span> <span word="higher">higher</span> <span word="levels">levels</span> <span word="of">of</span> <span word="outdoor">outdoor</span> <span word="light">light</span> <span word="at">at</span> <span word="night">night</span> <span word="may">may</span> <span word="be">be</span> <span word="at">at</span> <span word="higher">higher</span> <span word="risk">risk</span> <span word="for">for</span> <span word="breast">breast</span> <span word="cancer">cancer</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="study">study</span> <span word="from">from</span> <span word="Harvard">Harvard</span> <span word="T">T</span>.<span word="H">H</span>. <span word="Chan">Chan</span> <span word="School">School</span> <span word="of">of</span> <span word="Public">Public</span> <span word="Health">Health</span>. <span word="The">The</span> <span word="link">link</span> <span word="was">was</span> <span word="stronger">stronger</span> <span word="among">among</span> <span word="women">women</span> <span word="who">who</span> <span word="worked">worked</span> <span word="night">night</span> <span word="shifts">shifts</span>.</p><p>哈佛大学陈曾熙公共卫生学院的一项研究表示，那些在夜晚户外光线较强地区生活的女性更容易患上乳腺癌。对于那些上夜班的女性来说，这之间有着更紧密的联系。</p><p><span word="Previous">Previous</span> <span word="studies">studies</span> <span word="have">have</span> <span word="suggested">suggested</span> <span word="that">that</span> <span word="exposure">exposure</span> <span word="to">to</span> <span word="light">light</span> <span word="at">at</span> <span word="night">night</span> <span word="may">may</span> <span word="lead">lead</span> <span word="to">to</span> <span word="decreased">decreased</span> <span word="levels">levels</span> <span word="of">of</span> <span word="the">the</span> <span word="hormone">hormone</span> <span word="melatonin">melatonin</span> , <span word="which">which</span> <span word="can">can</span> <span word="disrupt">disrupt</span> <span word="circadian">circadian</span> <span word="rhythms">rhythms</span>—<span word="our">our</span> <span word="internal">internal</span> “<span word="clocks">clocks</span>” <span word="that">that</span> <span word="govern">govern</span> <span word="sleepiness">sleepiness</span> <span word="and">and</span> <span word="alertness">alertness</span>—<span word="and">and</span>, <span word="in">in</span> <span word="turn">turn</span>, <span word="lead">lead</span> <span word="to">to</span> <span word="increased">increased</span> <span word="breast">breast</span> <span word="cancer">cancer</span> <span word="risk">risk</span>.</p><p>先前的研究指出，晚上暴露于光线中可能会降低褪黑激素的含量，扰乱生理节奏，也就是我们身体内部控制睡意和敏捷性的“生物钟”，继而增加罹患乳腺癌的风险。</p>
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