多吃蓝莓真的可以降血压吗
<p><span word="Can">Can</span> <span word="a">a</span> <span word="cup">cup</span> <span word="of">of</span> <span word="blueberries">blueberries</span> <span word="keep">keep</span> <span word="the">the</span> <span word="doctor">doctor</span> <span word="away">away</span>? <span word="Maybe">Maybe</span>.</p><p>一杯蓝莓能保持身体健康？也许能。</p><p><span word="Researchers">Researchers</span> <span word="conducted">conducted</span> <span word="a">a</span> <span word="randomized">randomized</span>, <span word="double">double</span>-<span word="blind">blind</span>, <span word="placebo">placebo</span>-<span word="controlled">controlled</span> <span word="study">study</span> <span word="of">of</span> 40 <span word="postmenopausal">postmenopausal</span> <span word="women">women</span> <span word="ages">ages</span> 45 <span word="to">to</span> 65 <span word="with">with</span> <span word="high">high</span> <span word="blood">blood</span> <span word="pressure">pressure</span>. <span word="Half">Half</span> <span word="ate">ate</span> 22 <span word="grams">grams</span> <span word="of">of</span> <span word="freeze">freeze</span>-<span word="dried">dried</span> <span word="blueberry">blueberry</span> <span word="powder">powder</span> (<span word="equivalent">equivalent</span> <span word="to">to</span> <span word="a">a</span> <span word="cup">cup</span> <span word="of">of</span> <span word="blueberries">blueberries</span>) <span word="daily">daily</span> <span word="for">for</span> <span word="eight">eight</span> <span word="weeks">weeks</span>. <span word="The">The</span> <span word="others">others</span> <span word="consumed">consumed</span> <span word="an">an</span> <span word="identical">identical</span>-<span word="looking">looking</span> <span word="and">and</span> <span word="tasting">tasting</span> <span word="placebo">placebo</span>.</p><p>研究者对40位45岁至65岁的绝经后高血压妇女进行了一项随机、双盲、安慰剂对照的研究。其中一半每天吃22克冷冻干燥的蓝莓粉（相当于一杯蓝莓），共吃八周。另一半服用一种外观和味道与蓝莓粉完全相同的安慰剂。</p><p><span word="The">The</span> <span word="study">study</span>, <span word="in">in</span> <span word="The">The</span> <span word="Journal">Journal</span> <span word="of">of</span> <span word="the">the</span> <span word="Academy">Academy</span> <span word="of">of</span> <span word="Nutrition">Nutrition</span> <span word="and">and</span> <span word="Dietetics">Dietetics</span>, <span word="found">found</span> <span word="that">that</span> <span word="those">those</span> <span word="who">who</span> <span word="ate">ate</span> <span word="the">the</span> <span word="blueberry">blueberry</span> <span word="preparation">preparation</span> <span word="saw">saw</span> <span word="an">an</span> <span word="average">average</span> 5.1 <span word="percent">percent</span> <span word="decrease">decrease</span> <span word="in">in</span> <span word="systolic">systolic</span> <span word="blood">blood</span> <span word="pressure">pressure</span> (<span word="the">the</span> <span word="top">top</span> <span word="number">number</span>) <span word="and">and</span> <span word="a">a</span> 6.3 <span word="percent">percent</span> <span word="decrease">decrease</span> <span word="in">in</span> <span word="diastolic">diastolic</span> <span word="pressure">pressure</span>. <span word="Levels">Levels</span> <span word="of">of</span> <span word="nitric">nitric</span> <span word="oxide">oxide</span>, <span word="known">known</span> <span word="to">to</span> <span word="be">be</span> <span word="involved">involved</span> <span word="in">in</span> <span word="relaxing">relaxing</span> <span word="and">and</span> <span word="widening">widening</span> <span word="blood">blood</span> <span word="vessels">vessels</span>, <span word="increased">increased</span> <span word="significantly">significantly</span> <span word="in">in</span> <span word="the">the</span> <span word="blueberry">blueberry</span> <span word="eaters">eaters</span>. <span word="There">There</span> <span word="were">were</span> <span word="no">no</span> <span word="significant">significant</span> <span word="changes">changes</span> <span word="in">in</span> <span word="the">the</span> <span word="placebo">placebo</span> <span word="group">group</span>.</p><p>这项发表在《美国营养与饮食学会会刊》上的研究发现，蓝莓粉服用者的收缩压（高压）平均降低了5.1%，舒张压平均降低了6.3%，一氧化氮水平提高了很多——一氧化氮有助于放松和扩张血管。安慰组的相关指数没有显著变化。</p>
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