补钙须谨慎 过量有风险
<p><span word="While">While</span> <span word="many">many</span> <span word="people">people</span> <span word="aren">aren</span>'<span word="t">t</span> <span word="getting">getting</span> <span word="enough">enough</span> <span word="calcium">calcium</span>, <span word="new">new</span> <span word="research">research</span> <span word="cautions">cautions</span> <span word="that">that</span> <span word="some">some</span> <span word="people">people</span> <span word="may">may</span> <span word="have">have</span> <span word="the">the</span> <span word="opposite">opposite</span> <span word="problem">problem</span>: <span word="They">They</span> <span word="could">could</span> <span word="be">be</span> <span word="getting">getting</span> <span word="too">too</span> <span word="much">much</span>.</p><p>尽管有很多人钙摄入量不足，但新的研究提醒我们，也有一些人面临的问题可能恰好相反：他们的摄入量太多了。</p><p><span word="Americans">Americans</span> <span word="spend">spend</span> <span word="more">more</span> <span word="than">than</span> $1 <span word="billion">billion</span> <span word="a">a</span> <span word="year">year</span> <span word="on">on</span> <span word="calcium">calcium</span> <span word="supplements">supplements</span> <span word="in">in</span> <span word="hopes">hopes</span> <span word="of">of</span> <span word="staving">staving</span> <span word="off">off</span> <span word="osteoporosis">osteoporosis</span>, <span word="the">the</span> <span word="brittle">brittle</span> <span word="bone">bone</span> <span word="disease">disease</span> <span word="that">that</span> <span word="cripples">cripples</span> <span word="many">many</span> <span word="elderly">elderly</span> <span word="women">women</span> <span word="and">and</span> <span word="some">some</span> <span word="men">men</span>.</p><p>美国人一年花费逾10亿美元购买各类钙补充剂，期望能推迟骨质疏松症的发生。骨质疏松症是一种让骨头变脆的疾病，许多老年女性和部分男性都会因骨质疏松致残。</p><p><span word="Yet">Yet</span> <span word="recent">recent</span> <span word="studies">studies</span> <span word="link">link</span> <span word="calcium">calcium</span> <span word="supplements">supplements</span> <span word="to">to</span> <span word="a">a</span> <span word="higher">higher</span> <span word="risk">risk</span> <span word="of">of</span> <span word="heart">heart</span> <span word="attacks">attacks</span> <span word="and">and</span> <span word="kidney">kidney</span> <span word="stones">stones</span>. <span word="Last">Last</span> <span word="month">month</span>, <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="Preventive">Preventive</span> <span word="Services">Services</span> <span word="Task">Task</span> <span word="Force">Force</span> <span word="issued">issued</span> <span word="a">a</span> <span word="draft">draft</span> <span word="recommendation">recommendation</span> <span word="against">against</span> <span word="taking">taking</span> <span word="calcium">calcium</span> <span word="and">and</span> <span word="vitamin">vitamin</span> <span word="D">D</span>, <span word="saying">saying</span> <span word="there">there</span> <span word="wasn">wasn</span>'<span word="t">t</span> <span word="enough">enough</span> <span word="evidence">evidence</span> <span word="of">of</span> <span word="benefit">benefit</span> <span word="to">to</span> <span word="justify">justify</span> <span word="the">the</span> <span word="risk">risk</span>.</p><p>但近期的研究揭示，钙补充剂有可能导致心脏病和肾结石风险升高。美国预防医学工作组(<span word="U">U</span>.<span word="S">S</span>. <span word="Preventive">Preventive</span> <span word="Services">Services</span> <span word="Task">Task</span> <span word="Force">Force</span>)上月发布了一份建议书草案，不主张服用钙和维生素<span word="D">D</span>补充剂，称并没有充足的证据显示这样做利大于弊。</p><p><span word="For">For</span> <span word="generations">generations</span> <span word="of">of</span> <span word="Americans">Americans</span> <span word="who">who</span> <span word="grew">grew</span> <span word="up">up</span> <span word="exhorted">exhorted</span> <span word="to">to</span> <span word="drink">drink</span> <span word="their">their</span> <span word="milk">milk</span> <span word="to">to</span> <span word="maintain">maintain</span> <span word="strong">strong</span> <span word="bones">bones</span>, <span word="the">the</span> <span word="reports">reports</span> <span word="raised">raised</span> <span word="troubling">troubling</span> <span word="questions">questions</span>: <span word="Is">Is</span> <span word="calcium">calcium</span> <span word="not">not</span> <span word="so">so</span> <span word="important">important</span> <span word="after">after</span> <span word="all">all</span>? <span word="Are">Are</span> <span word="the">the</span> <span word="supplements">supplements</span> <span word="unsafe">unsafe</span>? <span word="And">And</span> <span word="how">how</span> <span word="much">much</span> <span word="is">is</span> <span word="too">too</span> <span word="much">much</span>?</p>
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