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发帖数: 23737 | 1 科学家最近发现西瓜中富含扩张血管的化合物—— L-瓜氨酸，可以减少心肌梗塞和中
风的危险。研究发现每日喝一定量的西瓜汁可以使高血压病人的血压下降[注]。
英国有160万人患有高血压，使心梗和中风的死亡率双倍地增加。英国人每年死于心梗
和中风者达6万以上。
一氧化氮是能使血管内皮扩张的重要物质，西瓜种的L-瓜氨酸可以使血液中的一氧化氮
含量明显增加。美国科学家给患高血压的自愿者每日6克从西瓜种提取出的L-瓜氨酸。6
星期后，9名受试者的血压均有下降，而且无副作用。但是如果是吃西瓜，大约一个半
西瓜才可达到这种治疗剂量。
佛罗里达州立大学的Arturo Figueroa博士说：这项研究说明保健食品有扩血管作用，
有一些食物可以防止高血压的发生，从而避免心梗和中风。虽然研究刚刚开始，结果令
人鼓舞，为今后在更多的人群中研究打下了坚实的基础。
研究人员之一Bahram Arjmandi教授说：所谓保健食品是指那些能促进健康、或防止疾
病、或多或少含有内在营养成分的食物。
科学家指出桔黄色的西瓜中的L-瓜氨酸含量高于红西瓜。两种西瓜均富含维生素A、维
生素B6、维生素C和纤维。西瓜中还含有钾元素，钾也具有降压作用。
番茄红素是西瓜中和其它水果中的色素，具有抗癌作用，也能增强生育能力。
[注]
http://www.dailymail.co.uk/health/article-1320416/Eating-watermelon-lowers-blood-pressure.html
Watermelon pill 'lowers blood pressure and could prevent strokes'
By Fiona Macrae
A dose of watermelon a day could help keep high blood pressure at bay.
Read more: http://www.dailymail.co.uk/health/article-1320416/Eating-watermelon-lowers-blood-pressure.html#comments#ixzz13C6scllQ
Researchers have discovered that the fruit is rich in compounds that widen
blood vessels - and may cut the risk of heart attacks and strokes.
And a daily fix of its juices could be enough to lower blood pressure in
patients suffering from hypertension, according to a study.
High blood pressure, which affects more than 16million men and women in the
UK, doubles the risk of a fatal heart attack or stroke and is blamed for
more than 60,000 deaths a year.
But watermelon is an edible source of L- citrulline - a compound vital in
the production of nitric oxide, a gas that widens blood vessels.
Researchers in the U.S. gave a group of volunteers a daily dose of 6g, or
slightly more than a teaspoonful, of L-citrulline extracted from watermelons
.
All of those taking part had pre-hypertension, or borderline high blood
pressure.
After six weeks, readings had improved in all nine participants, with none
experiencing any side-effects.
But there is one catch - you'd need to eat one-and-a-half watermelons a
day to achieve the same effect.
Dr Arturo Figueroa, of Florida State University, said: 'These findings
suggest that this " functional food" has a vasodilatory effect, and one that
may prevent pre-hypertension from progressing to full-blown hypertension, a
major risk factor for heart attacks and strokes.
'Given the encouraging evidence generated by this preliminary study, we hope
to continue the research and include a much larger group of participants in
the next round.'
Co-researcher Professor Bahram Arjmandi said: 'By functional foods, we mean
those foods scientifically shown to have health-promoting or disease-
preventing properties, above and beyond the other intrinsically healthy
nutrients they also supply.'
The researchers found that watermelons with orange flesh contain more L-
citrulline than those with red flesh.
Both varieties are rich in vitamins A, B6 and C and high in fibre.
Watermelon is also a good source of potassium, which is thought to lower
blood pressure.
And lycopene, the pigment that gives the fruit its colour, is credited with
a host of health benefits, from warding off cancer to boosting fertility.
Fortunately for those who aren't fond of the fruit, the L-citrulline
compound can also be bought in pill form.
Read more: http://www.dailymail.co.uk/health/article-1320416/Eating-watermelon-lowers-blood-pressure.html#comments#ixzz13C6XMY7s |
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