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如歌里所唱的，一勺糖有会影响药物吸收。爱荷华州立大学的科学家发表了一个新的研究——一勺油能让蔬菜变得更有营养。

The song says a spoonful of sugar helps the medicine go down, but an Iowa State University scientist has published new research suggesting a spoonful of oil makes vegetables more nutritious.

由食品科学和人类营养学副教授温迪怀特引领的一项新研究表明，吃加大豆油的沙拉可以帮助八种不同的微量营养素的吸收，从而促进人体健康。相对的，不加油吃同样的沙拉会降低身体吸收营养的能力。

A new study led by Wendy White, an associate professor of food science and human nutrition, shows that eating salad with added fat in the form of soybean oil promotes the absorption of eight different micronutrients that promote human health. Conversely, eating the same salad without the added oil lessens the likelihood that the body will absorb the nutrients.

这个研究最近出现在美国临床营养期刊的同行评审中，该结果可能降轻了那些为在沙拉中添加了调味料而忧愁的节食者的罪恶感。怀特教授的研究发现在蔬菜沙拉上添加油分有助于七种微量营养的吸收。这些营养素包括四种类胡萝卜素——α和β胡萝卜素、叶黄素和番茄红素还有维生素E和维生素K两种形式。油同样可以促进维生素A，由α和β胡萝卜素在肠内形成的八种微量营养的吸收。这个研究建立在先前怀特教授和她的小组对α和β胡萝卜素和番茄红素的研究基础之上。

The study appeared recently in the peer-reviewed American Journal of Clinical Nutrition, and the results may ease the guilt of countless dieters who fret about adding dressing to their salads.White's study found added oil aided in the absorption of seven different micronutrients in salad vegetables. Those nutrients include four carotenoids -- alpha and beta carotene, lutein and lycopene -- two forms of vitamin E and vitamin K. The oil also promoted the absorption of vitamin A, the eighth micronutrient tracked in the study, which formed in the intestine from the alpha and beta carotene. The new study builds on previous research from White's group that focused on alpha and beta carotene and lycopene.

怀特教授说更好地吸收营养对促进健康有一系列好处，包括癌症预防和视力保护。

White said better absorption of the nutrients promotes a range of health benefits, including cancer prevention and eyesight preservation.

研究也发现添加在蔬菜中的油量与营养吸收量存在一定比例关系。换句话说，油越多即营养吸收量越多。

The study also found that the amount of oil added to the vegetables had a proportional relationship with the amount of nutrient absorption. That is, more oil means more absorption.

怀特教授认为最佳的解释就是说:“添加两倍量的沙拉酱可使营养吸收增加两倍。”

"The best way to explain it would be to say that adding twice the amount of salad dressing leads to twice the nutrient absorption," White said.

她提醒，实验结果并没有鼓励沙拉食者在绿色蔬菜中加满调味料，但消费者应该更加遵循对美国每日约两汤匙油的饮食建议。

That doesn't give salad eaters license to drench their greens in dressing, she cautioned. But she said consumers should be perfectly comfortable with the U.S. dietary recommendation of about two tablespoons of oil per day.

这项研究共邀请了包括12名大学年龄的女性。她们食用了添加不同量的大豆油的沙拉。这大豆油是商业沙拉酱中的一种常见成分。

The study included 12 college-age women who consumed salads with various levels of soybean oil, a common ingredient in commercial salad dressings. The subjects then had their blood tested to measure the absorption of nutrients. Women were chosen for the trial due to differences in the speed with which men and women metabolize the nutrients in question.

然后对她们进行血液测试来测量营养素的吸收。选择女性来进行试验是因为考虑到男性和女性在代谢营养物的速度有差异。结果表明，最大的营养吸收量发生在32克左右的油中，这是研究的最大量，或者说略多于两汤匙的量。然而，White说，她发现受试者之间存在变率。

The results showed maximal nutrient absorption occurred at around 32 grams of oil, which was the highest amount studied, or a little more than two tablespoons. However, White said she found some variability among the subjects.

她说：“对大多数人来说，油会有助于吸收养分。统计学意义上的平均趋势是增加吸收的。”

"For most people, the oil is going to benefit nutrient absorption," she said. "The average trend, which was statistically significant, was for increased absorption."

研究的合作者包括前大学博士后研究员周洋、食品科学与人类营养的前毕业生研究助理Agatha Agustiana Crane、大学统计学教授Philip Dixon、quadt釉料的咨询顾问等等。

Research collaborators include Yang Zhou, a former ISU postdoctoral researcher; Agatha Agustiana Crane, a former graduate research assistant in food science and human nutrition; Philip Dixon, a University Professor of Statistics, and Frits Quadt of Quadt Consultancy, among others.

为本实验提供资金的国际食品公司，对实验结果无任何干涉。

Unilever, a global food company, provided funding for the research. The company had no input in the publication of the study.

即使一勺或两勺沙拉酱的确可以帮助你从你的蔬菜中获得最佳的营养利益，然而一勺糖和药物摄入的关系的研究仍然不在怀特教授的研究范围。

So a spoonful or two of salad dressing may indeed help you derive the optimal nutritional benefit from your veggies. The relationship between a spoonful of sugar and the medicine going down, however, remains outside the scope of White's research.

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