使用帮助  
会员浏览
    lpw的日记 用户日记页 -- 关闭
 
吃西瓜的五个理由(原译)字体[ ] 颜色[ 绿 ]
分类:随笔小记  创建于:2013-08-26 被查看:969次 [收藏:日记|作者] [评论]

吃西瓜的五个理由

摆在野餐桌上的大块多汁的西瓜片是典型的消暑佳品 —— 象点心一样够甜,却有益于我们的健康,正如最近的几项研究所显示的那样。(而且每块只有84大卡的热量!)

1. 西瓜能减轻肌肉酸痛。

据最近一项发表在《农业食品与化学杂志》上的研究,在一个高强度训练量之前,饮用西瓜汁有助于运动员降低心率和减轻第二天的肌肉酸痛。

这主要是因为西瓜富含一种叫做左旋瓜氨酸的氨基酸。人体可以将左旋瓜氨酸转化为左旋精氨酸,后者是一种可以帮助血管松弛并改善血液循环的重要氨基酸。参加该项研究的7名受试男性,在他们接受训练量之前,分别饮用17盎司(500 毫升)的天然西瓜汁、富含额外瓜氨酸的西瓜汁、或者一种充当安慰剂的饮料。

有意思的是,天然西瓜汁和添加了额外瓜氨酸的西瓜汁效果一样。研究者们还发现小肠细胞能从天然西瓜汁中比从添加瓜氨酸的西瓜汁中,能吸收更多的瓜氨酸,尤其是没有经过巴士德消毒的天然西瓜汁。


2. 西瓜有助于心脏健康。

据一项今年初由佛罗里达州立大学生理学家阿图洛-菲圭埃罗发表的研究显示,绝经女性在服用了6周的含有瓜氨酸和精氨酸的市售西瓜提取物补剂后,她们的心血管健康得到明显改善。

而且在一项也是由菲圭埃罗主持的发表于2012年的研究中,这样的西瓜提取物补剂还有助于减轻肥胖中年成人的高血压。(难怪他获得了两项由西瓜促进会提供的研究资助。) 

3. 西瓜可能是一种天然的伟哥。

至少已有一位西瓜研究者指出,血液循环的改善不光是有助于心脏。但是,为了达到想要的效果,你可能得吃掉极其大量的西瓜 ——不过西瓜吃得太多会导致不幸的副作用,因为西瓜一直享有天然利尿剂的盛名。

4.西瓜富含维生素和矿物元素,却低热量。

因为其名字(西瓜的英文直译为“水蜜瓜”--译者注),你可能会认为西瓜没有什么营养价值 ——它含有百分之九十多的水分。

但是一片10盎司(300毫升)的西瓜里,维生素AC的含量大约是日推荐摄取量的1/3,而且还含有少量的钾(约占日摄取量的9%)(查看:《收获越橘》)

5.西瓜甚至还可能抗癌。 

西瓜是饮食中蕃茄红素的最佳来源之一,而蕃茄红素是一种抗氧化剂,已经显示蕃茄红素能预防和治疗前列腺癌,目前科学家们正在进一步研究蕃茄红素这两种功能的具体细节。

(完)


附原文:

Five Reasons to Eat Watermelon

Big, sloppy slices of watermelon served at a picnic table are the quintessential summer snack—sweet enough to be dessert but, as several recent studies remind us, good for our health as well. (And only 84 calories per wedge!)

1. It soothes sore muscles.

According to a new study in the Journal of Agricultural Food and Chemistry, drinking watermelon juice before a hard workout helped reduce athletes' heart rate and next-day muscle soreness. That's because watermelon is rich in an amino acid called L-citrulline, which the body converts to L-arginine, an essential amino acid that helps relax blood vessels and improve circulation.

The study's seven participants, all men, were given 17 ounces (500 mL) of either natural watermelon juice, watermelon juice enriched with additional citrulline, or a placebo drink an hour before their workouts. Interestingly, the natural juice was just as effective as the enriched juice. The researchers also determined that intestinal cells can absorb more citrulline from watermelon juice than from citrulline supplements, especially when the juice is unpasteurized.

2. It helps heart health.

Postmenopausal women experienced improved cardiovascular health after six weeks of taking commercially available watermelon extract supplements containing citrulline and arginine, according to a study published earlier this year by Florida State University physiologist Arturo Figueroa.

And in a 2012 study—also led by Figueroa—such supplements helped alleviate high blood pressure in obese, middle-aged adults. (Not surprisingly, he's received two grants from the Watermelon Promotion Board.)

3. It could be a natural Viagra.

Improved circulation can benefit more than just the heart, as at least one watermelon researcher has pointed out. But you'd probably have to eat an awful lot to achieve the desired effect--and eating too much could cause unfortunate side effects, since watermelon has long had a reputation as a natural diuretic.

4. It's rich in vitamins and minerals, but low in calories.

Given its name, you might assume the fruit has little nutritional value—and it is more than 90 percent water. But a 10-ounce (300-mL) wedge of watermelon packs in about one-third of the recommended daily value of vitamins A and C, as well as a modest amount of potassium (9 percent of the daily value).

(Watch: Cranberry Harvest)

5. It could even combat cancer.

Watermelon is among the best dietary sources of lycopene, an antioxidant linked to both the prevention and treatment of prostate cancer, although scientists are still investigating the details of that connection.


※ 来源: http://www.JiaoYou8.com ※
 
更多"随笔小记"类日记
再见, 这三年丽龙在等你
杯酒人生wheatinautum
《谁怜孤鸿鸣悲凉?》八戒心
春景RiverTulip
李禺奇诗《两相思》cacloud
哪有那么多忧郁症wanda094
《曾有美女幻想症》八戒心
早春Zéphyr
寒雁于飞clarkli
精品串烧Zéphyr
查看全部...
 
   
关于我们 - 联系我们 - 服务条款 - 隐私权政策
© Unknown Space , since 1996