研究：防晒霜能延缓皮肤老化
<p>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。研究人员将903名年龄在55岁以下的被试者随机分成四组，其中两组每天使用防晒霜，但有一组还会服用β胡萝卜素；另外两组只是在被试者认为有必要的时候才使用防晒霜，也有一组服用β胡萝卜素。研究人员对被试者追踪研究四年半以后发现，每天使用防晒霜的两组被试者皮肤光老化的程度比偶尔使用防晒霜的被试者轻24%，而且各年龄段均无差别。研究人员还指出，一向被认为有抗衰老功能的β胡萝卜素在研究中没有表现出明显功效。</p><p>皮肤美容学家建议，早晨出门前要在脸、颈、手等直接被太阳照到的地方涂防晒霜，并且过段时间后要记得重新涂抹；就算一整天都待在室内，也应该使用防晒霜。另外，在使用防晒霜的同时，也要采取其他防晒措施，比如穿长袖衣服、戴宽檐帽、避免在上午十点到下午2点太阳光最强烈的时段出门等。</p><p><span word="A">A</span> <span word="new">new</span> <span word="study">study</span> <span word="has">has</span> <span word="found">found</span> <span word="that">that</span> <span word="applying">applying</span> <span word="sunscreen">sunscreen</span> <span word="every">every</span> <span word="day">day</span> <span word="can">can</span> <span word="do">do</span> <span word="more">more</span> <span word="than">than</span> <span word="lower">lower</span> <span word="your">your</span> <span word="risk">risk</span> <span word="of">of</span> <span word="skin">skin</span> <span word="cancer">cancer</span> — <span word="it">it</span> <span word="can">can</span> <span word="also">also</span> <span word="drastically">drastically</span> <span word="reduce">reduce</span> <span word="the">the</span> <span word="effects">effects</span> <span word="of">of</span> <span word="photoaging">photoaging</span>, <span word="or">or</span> <span word="the">the</span> <span word="way">way</span> <span word="frequent">frequent</span> <span word="sun">sun</span> <span word="exposure">exposure</span> <span word="can">can</span> <span word="make">make</span> <span word="your">your</span> <span word="skin">skin</span> <span word="look">look</span> <span word="older">older</span>. <span word="And">And</span> <span word="there">there</span>'<span word="s">s</span> <span word="more">more</span> <span word="good">good</span> <span word="news">news</span>: <span word="Even">Even</span> <span word="if">if</span> <span word="you">you</span> <span word="slacked">slacked</span> <span word="off">off</span> <span word="on">on</span> <span word="sunscreen">sunscreen</span> <span word="in">in</span> <span word="your">your</span> <span word="youth">youth</span>, <span word="middle">middle</span> <span word="age">age</span> <span word="isn">isn</span>'<span word="t">t</span> <span word="too">too</span> <span word="late">late</span> <span word="to">to</span> <span word="benefit">benefit</span> <span word="from">from</span> <span word="slathering">slathering</span> <span word="it">it</span> <span word="on">on</span>.</p>
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