You may be surprised to know the majority of Britons and Americans are medically dehydrated.
A survey conducted by New York Hospital and Cornell Medical Center found that 75 per cent of its 3,000 subjects suffered from chronic dehydration.
And polls in the UK suggest Brits consume just 850ml of water per day – less than half of the recommended daily intake — on average.
脱水
你可能会惊讶地知道，大多数英国人和美国人都有医学上的脱水。
纽约医院和康奈尔医学中心进行的一项调查发现，3000名受试者中有75%患有慢性脱水。
英国的民调显示，英国人平均每天只消耗850ml的水——不到建议每日摄入量的一半。
Your body needs water to function. Starving your brain of water can make you mentally fatigued.
In a 2019 study, researchers in China looked at the effects of severe dehydration on brain power and mood. They recruited 20 people who were not allowed to drink water for a day and a half.
By surveying the participants' mood before and after the water deprivation, the scientists at Peking University found dehydrated people felt twice as fatigued.
你的身体需要水才能发挥作用。让大脑缺水会使你精神疲惫。
在2019年的一项研究中，中国研究人员研究了严重脱水对脑力和情绪的影响。他们招募了20名在一天半内不允许喝水的人。
北京大学的科学家通过调查参与者在缺水前后的情绪，发现脱水的人感到疲劳的程度是正常人的两倍。
The study, published in the International Journal of Environmental Research and Public Health, also found that a lack of water slowed people's reading speed, reaction times and led them to make more errors.
'Not having enough water affects all of your body including your brain, leading to feelings of tiredness,' said Dr Hassain, from King's College London.
A 2015 survey of GPs in the UK found one in five patients go to the doctor with symptoms – such as tiredness – that can be caused by not drinking enough.
这项发表在《国际环境研究与公共卫生杂志》上的研究还发现，缺水会减缓人们的阅读速度和反应时间，并导致他们犯更多错误
伦敦国王学院的哈桑博士说：“没有足够的水会影响包括大脑在内的全身，导致疲劳感。”。
2015年在英国进行的一项全科医生调查发现，五分之一的患者因饮酒不足而出现疲劳等症状。
NHS guidelines state that women should drink 1.6 litres of fluid a day - the equivalent to eight glasses - while men should drink two litres, which is ten glasses.
This includes tea, coffee, milk and fruit juice, although water is by far the best source as it doesn't contain added caffeine or sugar.
NHS指南规定，女性每天应饮用1.6升液体，相当于8杯，而男性应饮用2升，相当于10杯。
这包括茶、咖啡、牛奶和果汁，尽管水是迄今为止最好的来源，因为它不含添加的咖啡因或糖。
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