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維生素D可預防感冒 常補充最有效

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發表於 2017-2-17 07:40:41 | 顯示全部樓層 |閱讀模式

2017-02-17_074144.jpg

(中央社巴黎2017年2月16日綜合外電報導)今天公布的研究指出,攝取維生素D補給品可預防感冒、流感等呼吸道感染,再度掀起了非處方營養補給品是否有效的論辯。

法新社與英國「每日電訊報」(Daily Telegraph)報導,刊登在英國醫學期刊「hosted-newsJ」的研究宣稱,評估14個國家共25份結果不一的臨床試驗後,「首度發現」維生素D和流感相關的「明確證據」。

這對體內維生素D含量非常低的人影響特別明顯。維生素D可透過一些食物攝取,皮膚接觸到紫外線時,人體也會自行合成。

許多人維生素D含量不足,特別是灰暗陰霾氣候區的居民。

科學研究多年來對維生素D結論不一,有些結論認為維生素D偏低會增加骨折、心臟疾病、大腸直腸癌、糖尿病、憂鬱症、阿茲海默症和死亡風險,但也有研究顯示,無法證明維生素D和疾病風險有關。

今天這份新研究是由倫敦大學瑪麗皇后學院(Queen Mary University of London)領導,涉及近1萬1000人,是歷來針對臨床試驗最大型的調查。

這份研究也發現,為什麼一些試驗顯示營養補給品有效,一些試驗卻不然。

「維生素D的保護效果,對體內含量最低,以及每天或每週攝取而非不常吃的人,效果最明顯。」(譯者:中央社鄭詩韻)

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Daily vitamin D dose would 'undeniably' prevent millions of colds

Daily vitamin D supplements would prevent more than three million people a year falling ill with a cold or similar infection, a major NHS-backed study has found.

Scientists last night said it is now “undeniable” that everyone should fortify themselves with the “sunshine” vitamin after an investigation showed doing so could half the risk of respiratory illness.

Up till now, Government campaigns urging greater intake of vitamin D have focused on the benefit to people’s bones.

This major collaborative research effort has yielded the first definitive evidence that vitamin D really does protect against respiratory infectionsProfessor Adrian Martineau, Queen Mary University of London

But in what is being hailed a “major step forward”, the new research now shows the vitamin also plays a significant role in preventing everyday illness.

Published in the British Medical Journal, the study explains how researchers examined data from almost 11,000 participants from all over the world about the effect of vitamin D on acute respiratory illnesses, which can include earache, bronchitis, pneumonia and the common cold.

The group of infections account for around 300,000 hospital admissions each year.

The analysis showed that regular supplements resulted in a 12 per cent reduction in the number of people suffering an acute respiratory tract infection.

Meanwhile, for people with the lowest levels of the vitamin, supplements cut their risk by 50 per cent.

Professor Adrian Martineau, who led the study at Queen Mary University of London, said: This major collaborative research effort has yielded the first definitive evidence that vitamin D really does protect against respiratory infections.”

Vitamin D is thought to protect against respiratory infections by boosting levels of antimicrobial peptides - natural antibiotic-like substances - in the lungs.

For many years, scientists have been trying to establish a link between respiratory infections and vitamin D, prompted by observations that these illnesses are most common in winter, when levels of the vitamin are lowest due to poor sunlight.

The data from previous studies yielded contradictory results, however, but it is now clear that this was because many of the participants were being given their supplements in big monthly doses, a practice now understood to be ineffective.

Supplements are effective when given daily or weekly, rather than in more widely spaced doses, the BMJ study concluded.

While certain foods such as oily fish contain vitamin D, most of it is obtained through sunlight on the skin, and Government advice currently states that everyone should “consider” taking supplements during the autumn and winter months to protect musculoskeletal health.

“By demonstrating this new benefit of vitamin D, our study strengthens the case for introducing food fortification to improve vitamin D levels in countries such as the UK where profound vitamin D deficiency is common,” said Professor Martineau.

Unlike countries such as Finland, the UK does not currently fortify food with Vitamin D as a matter of course, although Professor Martineau said that to do so would only cost a few pence per adult per year.

However, he added that the same preventative benefits could be derived from daily or weekly supplements.

A linked editorial in the BMJ claimed the new data only amounts to a “hypothesis...requiring confirmation”.

But Dr Benjamin Jacobs, a consultant paediatrician at the Royal National Orthopaedic Hospital, said: “The case for universal vitamin D supplements, or food fortification, is now undeniable.

"Governments and health professionals need to take Martineau’s study into account when setting Vitamin D policy now.”

http://www.telegraph.co.uk/science/2017/02/15/take-vitamin-d-supplements-prevent-common-cold-landmark-study/

人們常常在失去健康之後,才體會到健康的可貴。
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