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论坛首页 » 美食天地 » 研究显示: 吃得少能减少人体老化过程
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Judy

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地点 : 枫华外汇 www.fx366.com
发布时间 : 2006/10/31 10:27:56  
据世界日报讯,研究表明,限制热量摄入可以延长果蝇、蚯蚓和老鼠的寿命,这一方法对人类是否有同样作用呢?

一项以人类为对象的实验确实显示,低热量饮食确实可以减缓老化过程。

这项研究结果在今天出版的《美国医生协会期刊》(Journal of the AmericanMedical Association)上发表。研究并未得出「吃得少的人活得长」这一结论,但确实发现长期限制热量摄入,可以减缓人体新陈代谢的速率、减少人体细胞受到的损害,提高空腹胰岛素(fasting insulin)的水平,降低体温,而这一切都能减少人体老化过程。

报告作者之一、班宁顿生物医学研究中心(Pennington Biomedical Research Centre ofLouisiana State University)的史密斯医生说:「简单而言,吃得少,人体的负担就较小,受到的损害也较小。」

更精确地说,较少的热量摄入使得DNA受到的损害较小,从而对防止癌症发生和心脏疾病有好处。当然,这只是理论推测,尚未得到证实。

只有48人参加了最新研究。他们都多少超重,超重比例为正常体重的25%30%,因此并不算「痴肥」(obese)。

研究对象被分为四个小组:通过节食将普通热量摄入减少25%者;半数通过节食、半数通过运动将普通热量摄入减少25%者;每日热量摄入只有890卡路里者,及对照组。经过六个月,那些每日摄入890卡路里者体重降低14%,其它两个限制热量摄入组别体重下降10%,不过后者的新陈代谢也有所减缓。

史密斯医生指出,热量限制和节食并非完全一回事:在经过一段时间的热量限制后,人体对之适应,因此可以更高效地使用能量。他指出,将热量摄入减少25%需要坚强毅力,但所有的参与者在经过一段时间的调整后,不再感到饥肠辘辘。

在现实生活中,人们能否坚持严格的热量摄入限制,目前还是个未知数。毕竟,参加实验的人热情很高,而且通过参加实验得到经济补偿。

根据联邦统计局数字,加拿大三分之二的成年人和三分之一的儿童超重或痴肥。
外汇交易看沉浮,桔枫随笔著文章。 枫华外汇 www.fx366.com
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