我们该喝多少水

◎黄晓琴

天热时要多喝水，感冒咳嗽时要多喝水，气候干燥时要多喝水，上火时要多喝水。那么，我们一天到底要喝多少水呢？一项发表在国际学术期刊《科学》上的研究显示，每个人需要摄入的水量是不同的，具体需水量取决于多种因素。

Track 11

A famous health tip says you’d better drink eight glasses of water (about two liters) a day. However, the results of a new study suggest that less is needed.

An international group led by scientists at the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences found that the average daily water intake of a man in his twenties should be 1.5 to 1.8 liters, while it should be 1.3 to 1.4 liters for a female in the same age group.

The researchers1)investigated5,604 participants from the ages of 8 days to 96 years and from more than 20 countries, using isotope-tracking methods. They have found that a man aged 20 to 35 consumes 4.2 liters of water each day, while a woman aged 30 to 60 consumes 3.3 liters, with the water requirements dropping as he or she ages.

Since the2)metabolismand water exchange on skin can provide 15 percent, while food and drinking contribute half each of the remaining 85 percent,people are thus suggested to drink less than 45 percent of the total daily3)turnover, according to the researchers.

1) investigatev.调查

2) metabolismn.新陈代谢

3) turnovern.周转率；流动率

每天要喝8 杯水（约2 升）的健康小贴士广为流传，但一项新的研究显示，每天8 杯水的饮水建议可能超过大多数人真正的需求量。

由中国科学院深圳先进技术研究院的科学家领导的一个国际小组发现，20 多岁男性的平均每日水分摄入量应为1.5～1.8 升，而同年龄组的女性则应为1.3～1.4 升。

研究人员使用同位素追踪方法，对20 多个国家共计5604 名受试者进行了研究，样本年龄覆盖8 天大的婴儿到96 岁的老人。他们发现，20～35 岁的男性每天消耗4.2 升水，而30～60 岁的女性每天消耗3.3 升水，随着年龄的增长，人体对水的需求量会下降。

研究人员表示，因为人体代谢和体表水交换可提供其中的15%，其余85%的需水量来自食物和饮水，食物和饮水各半，因此建议人们每天饮用的水少于总需求量的45%。