專家質疑:夏日多喝水或有害健康
一資料顯示，以前專家號召提倡的“多喝水、少生病或者每日八杯水，遠離疾病”的健康建議日前遭到了一些專家的質疑，據悉，確實是有多喝水保護腎臟、或者多喝水可以減肥、提高注意力水平的說法，但是確實沒有任何證據顯示喝水可以防治疾病，專家還警告，飲水量過大甚至還會對健康有害。
They say that scientific claims behind long-standing government guidelines are worse than ‘nonsense’. The NHS – along with leading doctors and nutritionists – advises the public to drink about 1.2 litres (or two-and-a-half pints) of water per day. However, a report describes the danger of dehydration as a ‘myth’ and says there is no evidence behind claims that water prevents multiple health problems.
英國國家醫療服務系統以及醫生還有營養專家們向公衆提衝每日喝水要達到1.2公升的量，才能維持人體正常水平需要。可惜，一項資料顯示，“脫水”的導致的危害至今仍舊是一個“謎”，沒有任何證據顯示水能夠防治多方面的身體疾病。
Glasgow-based GP Margaret McCartney says the NHS Choices website’s advice that people should drink six to eight glasses a day is ‘not only nonsense, but thoroughly debunked nonsense’. She adds that the benefits of the drink are often exaggerated by ‘organisations with vested interests’ such as bottled water brands. Writing in the British Medical Journal, Dr McCartney also points out that research shows drinking when not thirsty can impair concentration, rather than boost it, and separate evidence suggests that chemicals used for disinfection found in bottled water could be bad for your health.
專家McCartney說：“NHS官網上關於每人每天需要喝六到八杯水的建議，不僅僅是毫無意義，根本就是胡說八道。”她補充道，飲水的益處被健康組織“嚴重誇大”了，而且還隱含了很多商業因素，各種礦泉水、純淨水的廠商、牌子相互競爭而引發的的“血戰”。這項研究發表在《英國醫學雜誌》上，專家McCartney說：“研究顯示，當不感覺飢渴的時候喝水可以提高專注力，這種說法有悖現實。而且，用於瓶裝水的具有‘殺菌功效的化學物質’還有損害健康的弊端。”
Drinking excessive amounts can also lead to loss of sleep as people have to get up in the night to go to the toilet, and other studies show it can even cause kidney damage, instead of preventing it. Worryingly, Dr McCartney also warns that taking on too much water can lead to a rare but potentially fatal condition called hyponatraemia, which sees the body’s salt levels drop and can lead to swelling of the brain.
喝水的弊端經專家分析有如下幾個方面：比如晚上多喝水容易導致缺覺，頻繁上廁所對睡眠狀況有害，如此說來，晚上多喝水還會對腎臟有損耗，而不是防止腎臟疾病的功效。此外，專家還警告，飲水過量會導致致命疾病---低鈉血癥，這種疾病導致體內鹽分含量急速降低，最後引發腦水腫和肺水腫狀況。
