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叶黄素对你的眼睛和心脏有好处吗?  

2014-10-12 23:46:26|  分类: 植物精华与健康 |  标签: |举报 |字号 订阅

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Lutein is one of the carotenoids, yellow and orange pigments found in many fruits and vegetables including mangoes, corn, sweet potatoes, carrots, squash, tomatoes and dark, leafy greens such as kale, collards and bok choy. It is the major carotenoid in the fruit and vegetable rich Asian diet, and a minor one in the typical American diet which doesn't contain enough fruits and vegetables.

There is very good evidence that the lutein in food helps protect against cataracts and macular degeneration, two common, age-related eye disorders. Lutein and another carotenoid, zeaxanthin, form the yellow pigment of the retina and absorb blue light, a harmful component of sunlight. In addition, new evidence from a study completed last year showed that lutein may help protect against clogging of the carotid arteries in the neck, an indication of atherosclerosis, the disease that leads to most heart attacks. The study, at the University of Southern California, found that participants with the highest levels of lutein in the blood at the outset had no increase in plaque in the arteries throughout the 18 months of the study. Just the opposite occurred among those with the lowest lutein levels at the outset - arterial clogging worsened. The researchers also doused sections of human arteries removed during surgery with high concentrations of lutein. They found that these arteries attracted fewer white cells, which are involved in the process that results in clogging.

有很好的证据表明,在食品中的叶黄素有助于预防白内障和黄斑变性这两种与年龄相关的常见的眼部疾病。叶黄素和另一个类胡萝卜素玉米黄质,形成黄色素的视网膜和吸收蓝光这一阳光中的有害成分。此外,从去年完成的一项研究的新的证据表明,叶黄素可能有助于防止堵塞脖子上的颈动脉,这是导致大多数心脏病发作的疾病的动脉粥样硬化的一个指标。南加州大学的这项研究发现,血液中有叶黄素的最高水平的参与者, 在18个月的研究中在一开始在动脉就没有增加斑块。恰恰相反,叶黄素含量最低的那些在开始时就发生动脉阻塞恶化。研究人员在手术中期间还使用高浓度的叶黄素浇灭了部分人的动脉切除。他们发现这些动脉引起白细胞减少,参与这一过程导致堵塞。

Despite the importance of lutein to eye and heart health, there are still many unanswered questions about the best way to get it. We don't know if supplements have the same effect as naturally occurring lutein in fruits and vegetables. While some studies have shown that taking supplements can help improve vision slightly among people who already have cataracts or macular degeneration, there is only limited evidence that supplements can help prevent either of these conditions, and it remains unclear how much lutein is needed for prevention.

The best thing you can do to prevent eye disorders and heart disease is to make sure that your diet contains lots of the lutein-rich fruits and vegetables. In addition to the ones listed above, you can get zeaxanthin in orange bell peppers, oranges, corn and honeydew melon. Egg yolks also contain both lutein and zeaxanthin, but if you have high cholesterol, you're much better off getting the yellow nutrients from fruits and vegetables.

By Andrew Weil, M.D.

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叶黄素:对你的眼睛和心脏有好处吗? - 智能药与保健品 - 健康之路


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叶黄素:对你的眼睛和心脏有好处吗? - 智能药与保健品 - 健康之路

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