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Vitamins and other food supplements taken by millions of women may actually put them at more risk, according to a major study.
Scientists say there is little evidence the pills do any good – and in fact some could be causing serious harm.
A study involving nearly 39,000 women has found multivitamins, vitamin B, folic acid, iron, magnesium and copper all increased the statistical risk of premature death.
Nearly a third of adults in Britain take some form of dietary supplement most days and the industry is worth £675million a year.
Some of the most popular pills include multivitamins, vitamin A, C and E, iron, folic acid and calcium – which are all thought to improve long-term health and ward off illnesses.
Scientists from Finland, Norway, the U.S. and South Korea looked at the long-term health effects of common vitamin pills and minerals on 38,772 women aged 55 to 69.
Over an 18-year period the women recorded any supplements they regularly took.
The results, published in the Archives of Internal Medicine, found copper increased the risk of dying prematurely by 18 per cent. Folic acid – which pregnant women are told to take to protect their child against spina bifida – increased risk of death by almost 6 per cent, while iron raised the risk by nearly 4 per cent.
Multivitamins raised the risk by 2.4 per cent, vitamin B6 by 4 per cent, magnesium by 3.6 per cent and zinc by 3 per cent.
The scientists do not fully understand how supplements may trigger early death, but they may interfere with the body’s natural defences. They say the supplements should only be taken by patients who are malnourished and only under the supervision of a doctor. Everyone else should ensure they eat a balanced diet to get adequate vitamins and minerals.
Jaakko Mursu, from the University of Eastern Finland, said: ‘Based on existing evidence, we see little justification for the general and widespread use of dietary supplements.
‘We recommend that they be used with strong medically-based cause, such as symptomatic nutrient deficiency disease.
參考譯文：
最新研究表明，數(shù)百萬(wàn)女性經(jīng)常服用的維生素及膳食補(bǔ)充制劑很可能有害健康。
科學(xué)家表示，沒(méi)有證據(jù)表明這些制劑對(duì)健康有益，而且實(shí)際上有些制劑還可能損害健康。
一項(xiàng)針對(duì)近3.9萬(wàn)名女性的研究發(fā)現(xiàn)，從統(tǒng)計(jì)數(shù)據(jù)來(lái)看，多種維生素制劑、B族維生素、葉酸、以及鐵、鎂、銅等礦物元素都會(huì)增加過(guò)早死亡的風(fēng)險(xiǎn)。
英國(guó)近1/3的成年人經(jīng)常服用某種膳食補(bǔ)充劑，該產(chǎn)業(yè)年產(chǎn)值達(dá)6.75億英鎊。
最受歡迎的包括多種維生素、維生素A、C、E，鐵、葉酸、和鈣等制劑，據(jù)稱有利于長(zhǎng)期健康，還可以預(yù)防疾病。
來(lái)自芬蘭、挪威、美國(guó)和韓國(guó)的科學(xué)家研究了普通維生素和礦物元素制劑的長(zhǎng)期健康效果，共有38772名年齡在55歲至69歲的女性接受了調(diào)查。
在調(diào)查的18年中，受訪女性記錄了她們服用的所有補(bǔ)充制劑。
研究發(fā)現(xiàn)，銅元素會(huì)使過(guò)早死亡的風(fēng)險(xiǎn)增加18%，葉酸和鐵元素分別會(huì)使這一風(fēng)險(xiǎn)增加近6%和近4%。為預(yù)防新生兒脊柱裂，孕婦需服用葉酸。研究結(jié)果發(fā)表在《內(nèi)科醫(yī)學(xué)檔案》上。
多種維生素制劑會(huì)使過(guò)早死亡的風(fēng)險(xiǎn)增加2.4%，維生素B6會(huì)使風(fēng)險(xiǎn)增加4%，鎂和鋅分別會(huì)使這一風(fēng)險(xiǎn)增加3.6%和3%。
科學(xué)家尚不完全清楚維生素制劑導(dǎo)致過(guò)早死亡的原因，但這些制劑會(huì)妨礙人體的自然抵抗力。科學(xué)家表示，只有那些營(yíng)養(yǎng)不良的病人才需要服用這種制劑，而且需要醫(yī)生指導(dǎo)。其他人應(yīng)該確保均衡飲食，從食物中獲得足夠的維生素和礦物質(zhì)。
東芬蘭大學(xué)的賈科•瑪蘇說(shuō)：“從現(xiàn)有證據(jù)來(lái)看，不應(yīng)大范圍應(yīng)用膳食補(bǔ)充劑。”
“除非有明顯的病因，比如營(yíng)養(yǎng)缺乏癥，否則我們不建議服用膳食補(bǔ)充劑。”
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