甜菜汁对老年人脑健康有利
文章来源:未知 文章作者:meng 发布时间:2010-11-03 02:26 字体: [ ]  进入论坛
(单词翻译:双击或拖选)

Researchers for the first time have shown that drinking beet1(甜菜) juice can increase blood flow to the brain in older adults – a finding that could hold great potential for combating the progression of dementia(痴呆) . The research findings are available online in Nitric Oxide2: Biology and Chemistry, the peer-reviewed journal of the Nitric Oxide Society and will be available in print soon.

"There have been several very high-profile studies showing that drinking beet juice can lower blood pressure, but we wanted to show that drinking beet juice also increases perfusion(灌注,充满) , or blood flow, to the brain," said Daniel Kim-Shapiro, director of Wake Forest University's Translational(平移的,直移的) Science Center; Fostering(养育,哺育) Independence in Aging. "There are areas in the brain that become poorly perfused as you age, and that's believed to be associated with dementia and poor cognition."

High concentrations of nitrates are found in beets3, as well as in celery(芹菜) , cabbage and other leafy green vegetables like spinach4(菠菜) and some lettuce5(生菜,莴苣) . When you eat high-nitrate foods, good bacteria in the mouth turn nitrate(硝酸盐) into nitrite(亚硝酸盐) . Research has found that nitrites can help open up the blood vessels6 in the body, increasing blood flow and oxygen specifically to places that are lacking oxygen.

In this study, the first to find a link between consumption of nitrate-rich beet juice and increased blood flow to the brain, Translational Science Center researchers looked at how dietary nitrates affected7 14 adults age 70 and older over a period of four days.

On the first day, the study subjects reported to the lab after a 10-hour fast, completed a health status report, and consumed either a high- or low-nitrate breakfast. The high-nitrate breakfast included 16 ounces of beet juice. They were sent home with lunch, dinner and snacks conforming to their assigned diets.

The next day, following another 10-hour fast, the subjects returned to the lab, where they ate their assigned breakfasts. One hour after breakfast, an MRI recorded the blood flow in each subject's brain. Blood tests before and after breakfast confirmed nitrite levels in the body.

For the third and fourth days of the study, the researchers switched the diets and repeated the process for each subject.

The MRIs showed that after eating a high-nitrate diet, the older adults had increased blood flow to the white matter of the frontal lobes8(大脑前庭) – the areas of the brain commonly associated with degeneration that leads to dementia and other cognitive9 conditions.

"I think these results are consistent and encouraging – that good diet consisting of a lot of fruits and vegetables can contribute to overall good health," said Gary Miller10, associate professor in the Department of Health and Exercise Science and one of the senior investigators11 on the project.

To make the sometimes-bitter beet juice tastier – so a greater number of people will drink it and reap its health benefits – the university has worked with a company to create a new beet juice-based beverage12(饮料) . The university is currently looking into ways of marketing13 the beverage.



点击收听单词发音收听单词发音  

1 beet 9uXzV     
n.甜菜;甜菜根
参考例句:
  • He farmed his pickers to work in the beet fields. 他出租他的摘棉工去甜菜地里干活。
  • The sugar beet is an entirely different kind of plant.糖用甜菜是一种完全不同的作物。
2 oxide K4dz8     
n.氧化物
参考例句:
  • Oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见。
  • How can you get rid of this oxide coating?你们该怎样除去这些氧化皮?
3 beets 88b1e961db3387e932ee94bcb085128f     
甜菜( beet的名词复数 ); 甜菜根; (因愤怒、难堪或觉得热而)脸红
参考例句:
  • Beets are Hank's favorite vegetable. 甜菜根是汉克最爱吃的蔬菜。
  • In this enlargement, barley, alfalfa, and sugar beets can be differentiated. 在这张放大的照片上,大麦,苜蓿和甜菜都能被区分开。
4 spinach Dhuzr5     
n.菠菜
参考例句:
  • Eating spinach is supposed to make you strong.据说吃菠菜能使人强壮。
  • You should eat such vegetables as carrot,celery and spinach.你应该吃胡萝卜、芹菜和菠菜这类的蔬菜。
5 lettuce C9GzQ     
n.莴苣;生菜
参考例句:
  • Get some lettuce and tomatoes so I can make a salad.买些莴苣和西红柿,我好做色拉。
  • The lettuce is crisp and cold.莴苣松脆爽口。
6 vessels fc9307c2593b522954eadb3ee6c57480     
n.血管( vessel的名词复数 );船;容器;(具有特殊品质或接受特殊品质的)人
参考例句:
  • The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
  • All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
7 affected TzUzg0     
adj.不自然的,假装的
参考例句:
  • She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • His manners are affected.他的态度不自然。
8 lobes fe8c3178c8180f03dd0fc8ae16f13e3c     
n.耳垂( lobe的名词复数 );(器官的)叶;肺叶;脑叶
参考例句:
  • The rotor has recesses in its three faces between the lobes. 转子在其凸角之间的三个面上有凹槽。 来自辞典例句
  • The chalazal parts of the endosperm containing free nuclei forms several lobes. 包含游离核的合点端胚乳部分形成几个裂片。 来自辞典例句
9 cognitive Uqwz0     
adj.认知的,认识的,有感知的
参考例句:
  • As children grow older,their cognitive processes become sharper.孩子们越长越大,他们的认知过程变得更为敏锐。
  • The cognitive psychologist is like the tinker who wants to know how a clock works.认知心理学者倒很像一个需要通晓钟表如何运转的钟表修理匠。
10 miller ZD6xf     
n.磨坊主
参考例句:
  • Every miller draws water to his own mill.磨坊主都往自己磨里注水。
  • The skilful miller killed millions of lions with his ski.技术娴熟的磨坊主用雪橇杀死了上百万头狮子。
11 investigators e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
12 beverage 0QgyN     
n.(水,酒等之外的)饮料
参考例句:
  • The beverage is often colored with caramel.这种饮料常用焦糖染色。
  • Beer is a beverage of the remotest time.啤酒是一种最古老的饮料。
13 marketing Boez7e     
n.行销,在市场的买卖,买东西
参考例句:
  • They are developing marketing network.他们正在发展销售网络。
  • He often goes marketing.他经常去市场做生意。
TAG标签: research juice dementia beet
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片