菜太淡沒(méi)有味道？加一勺鹽！你做菜時(shí)也用過(guò)這一招嗎？鹽被稱為百味之首，但世界衛(wèi)生組織建議，每人每天食鹽攝入量不要超過(guò)5克，但如果攝入量極低也對(duì)身體有害。來(lái)看看科學(xué)家們是怎么說(shuō)的。

Salt consumption exceeds national and World Health Organization guidelines in most countries, but only the highest-sodium diets, such as in China, are linked to clear health risks, researchers said.

大多數(shù)國(guó)家居民的鹽攝入量都超過(guò)國(guó)家和世界衛(wèi)生組織指導(dǎo)量，不過(guò)，研究人員表示，只有鈉含量非常高的飲食——例如中餐，才明確與健康風(fēng)險(xiǎn)有關(guān)。

Only individuals with a daily salt intake of at least 12.5 grams -- about two-and-a-half teaspoons -- were associated with increased blood pressure and a greater risk of stroke, they reported in The Lancet, a medical journal.

研究發(fā)現(xiàn)，只有每日鹽攝入量達(dá)到12.5克（約兩茶勺半）以上的個(gè)體才伴有血壓增高、中風(fēng)可能性加大的危險(xiǎn)。該研究結(jié)果發(fā)表在醫(yī)學(xué)刊物《柳葉刀》上。

WHO recommends capping salt consumption at five grams per day, but this target is not known to have been achieved at a national level anywhere in the world, the survey of more than 90,000 people spread across 300 distinct communities in 18 countries found.

調(diào)查發(fā)現(xiàn)，盡管世衛(wèi)組織建議每日鹽攝入量不超過(guò)5克，但目前世界上還沒(méi)有哪個(gè)國(guó)家能達(dá)到這一目標(biāo)。超過(guò)9萬(wàn)人參與了這項(xiàng)調(diào)查，他們來(lái)自18個(gè)國(guó)家的300個(gè)不同社區(qū)。

"We should be far more concerned about targeting communities and countries with high average sodium intake -- above five grams (equivalent to 12.5 grams of salt), such as China -- and bringing them down to the moderate range" of 7.5 to 12.5 grams of salt, said lead author Andre Mente, a professor in the Population Health Research Institute at McMaster University in Canada.

研究報(bào)告的主要作者、加拿大麥克馬斯特大學(xué)人口健康研究所的安德烈·門特教授說(shuō)：“我們應(yīng)該更加關(guān)注平均鈉攝入量高的團(tuán)體和國(guó)家，即日均鈉攝入量超過(guò)5克（相當(dāng)于12.5克鹽）國(guó)家，比如中國(guó)，應(yīng)將他們的攝入量降至適當(dāng)范圍內(nèi)，即日均攝入7.5克至12.5克食鹽?！?/p>

One gram of sodium equals 2.5 grams of salt.

1克鈉相當(dāng)于2.5克食鹽。

Four-fifths of the groups examined in China had average daily salt intake of 12.5 grams, whereas in other countries 84 percent ingested between 7.5 and 12.5 grams.

在參與調(diào)查的中國(guó)人中，有五分之四日均鹽攝入量為12.5克，而其他國(guó)家84%的人日均鹽攝入量在7.5克至12.5克之間。

"Our study adds to growing evidence that, at moderate intake, sodium may have a beneficial role in cardiovascular heath, but a potentially more harmful role when intake is very high or very low," he said in a statement.

安德烈·門特在聲明中表示：“我們的研究進(jìn)一步證明，在適量攝入的情況下，鈉對(duì)心血管健康有利，但是如果攝入量極高或極低的話，可能存在更為有害的影響?！?/p>

The human body needs essential nutrients such as sodium and many vitamins, but the ideal amount remains subject to debate.

人體需要鈉和多種維生素等必要營(yíng)養(yǎng)物質(zhì)，但這些物質(zhì)的理想攝入量還沒(méi)有定論。

The study examined urine and blood samples, along with health records, for 95,767 women and men monitored over an eight-year period.

研究人員在8年的時(shí)間里對(duì)95767名男女進(jìn)行了監(jiān)測(cè)，檢驗(yàn)了他們的尿液和血液樣本以及健康數(shù)據(jù)。

Nearly 3,700 of the participants died during that time and 3,543 had "major cardiovascular events".

研究期間，近3700名參與者離世，3543人患有“嚴(yán)重心血管疾病”。

Experts not involved in the study were sharply critical of its methodology. The technique for collecting urine samples is notoriously unreliable, they noted. And the fact that it was an observational study -- as opposed to clinical trials -- means that no firm conclusions can be drawn as to cause-and-effect.

未參與這項(xiàng)研究的專家嚴(yán)厲批評(píng)了這種方法論，他們指出，搜集尿液樣本的方法非常不可靠，且這種方法實(shí)際上是觀察性研究，而不是臨床試驗(yàn)，這意味著無(wú)法得出確定的因果結(jié)論。

Most controversial was the suggestion that low sodium intake may, in fact, provoke heart disease.

研究認(rèn)為，低鈉攝入量實(shí)際上會(huì)引發(fā)心臟疾病，大多數(shù)爭(zhēng)議也正集中于此。

"There are no known mechanisms that could explain this observation," commented Tom Sanders, professor emeritus of nutrition and dietetics at King's College London.

倫敦大學(xué)國(guó)王學(xué)院營(yíng)養(yǎng)學(xué)和飲食學(xué)榮譽(yù)教授湯姆·桑德斯評(píng)論稱：“現(xiàn)有機(jī)制無(wú)法解釋這種觀察現(xiàn)象。”

"Sodium is an essential nutrient but the requirement is very low at about 0.5 grams (1.25 grams of salt) per day."

“鈉是一種必要營(yíng)養(yǎng)成分，但是需求量非常低，每天約0.5克（相當(dāng)于1.25克食鹽）?！?/p>

Ageing populations, he added, should still be advised to restrict the addition of salt to food.

他補(bǔ)充說(shuō)，還是要建議老年人控制鹽攝入量。

中國(guó)人每天到底吃了多少鹽？

2016年，研究人員在《美國(guó)醫(yī)學(xué)會(huì)雜志》上報(bào)告說(shuō)，盡管中國(guó)人的平均鹽攝入量自2000年以來(lái)不斷下降，但仍遠(yuǎn)高于世界衛(wèi)生組織推薦的最大鹽攝入量。

領(lǐng)導(dǎo)這一研究的中國(guó)國(guó)家食品安全風(fēng)險(xiǎn)評(píng)估中心技術(shù)總師吳永寧告訴新華社記者，中國(guó)自1990年以來(lái)先后開展了5次總膳食研究調(diào)查，前4次覆蓋12個(gè)省份，代表中國(guó)人口的46%，第5次總膳食研究從2009年開始到2013年結(jié)束，覆蓋21個(gè)省，代表中國(guó)人口的近80%。

他們對(duì)2000年第3次總膳食研究以來(lái)中國(guó)人對(duì)食鹽和鈉的消費(fèi)量進(jìn)行了分析。研究表明，從2000年到2009年的10年間，中國(guó)居民食鹽消費(fèi)量從11.8克/天下降到9.2克/天，下降了約22%。

吳永寧說(shuō)，如果能保持這樣的速度，中國(guó)有可能實(shí)現(xiàn)世界衛(wèi)生組織提出的，到2025年降低鹽攝入量30%的目標(biāo)。但問(wèn)題在于，成品食鹽只是中國(guó)人攝入鈉的來(lái)源之一，醬油等調(diào)味品以及咸菜等加工食品含有大量鹽分，但通常沒(méi)有計(jì)入鹽攝入量調(diào)查中。

來(lái)源：法新社、參考消息網(wǎng)、新華社

翻譯&編輯：yaning