評論
打印
Moving on to the last sub-topic in this presentation.
下面我們來看本講的最后一個話題
Do organic foods prevent cancer better than conventional foods?
有機食品是否比傳統食品具有更強的防癌功效?
No one credible study has indicated any benefit;
沒有任何權威研究可以證明這一點，
though studies do show a certain nutritional advantage of some components of fruits and vegetables.
盡管一些研究確實顯示一些水果和蔬菜確實有額外的營養功效
Let's look at a recent study concerning the antioxidant benefits of tomatoes.
我們來看一個最近的實驗，是關于番茄的抗氧化效果的
In 2003, a study by French researchers sought to determine the antioxidant benefits of organic versus conventional tomatoes.
2003年法國研究人員想要研究有機番茄和傳統番茄在抗氧化方面的效用有何差異
Using a study group of 20 nonsmoking females between the ages of 21 to 39 years,
研究人員對20名21-39歲的不吸煙的女性進行試驗
the researchers compared the antioxidant micro-constituent contents between organically and conventionally grown tomatoes
研究人員比較了有機和傳統番茄中的抗氧化成分的水平
and to evaluate whether the consumption of purees made of these tomatoes
然后讓實驗對象每天分別服用由這兩種番茄制成的番茄醬，
could differently affect the plasma levels of antioxidant micro-constituents in humans.
最后研究它們會對人體內血漿中的抗氧化成分造成哪些影響
It was discovered that the variety of fresh organic tomatoes used had higher vitamin C,
實驗結果表明，與傳統番茄相比，除了綠原酸之外，
carotenoids, and polyphenol contents except for chlorogenic acid than conventional tomatoes.
有機番茄中的維生素C類胡蘿卜素和多酚含量都更高，
In tomato purees, concentrations of Vitamin C and polyphenols
制成番茄醬后，有機番茄中的維生素C和多酚含量
remained higher than purees made out of conventional tomatoes.
依舊高于傳統番茄制作的番茄醬
However, for the nutritional intervention,
在三周內，兩組實驗對象每天都分別
no significant difference after three weeks of consumption of 96 grams per day approximately one half cup of tomato puree
食用96克番茄醬，也就是半杯，但三周后，結果顯示，
was found between the two purees with regard to their ability to affect the plasma levels of the two major antioxidants, Vitamin C and lycopene.
兩組實驗對象血漿中的兩種主要的抗氧化劑，也就是維生素C和番茄紅素都沒有很大變化，因此有機和傳統食品在營養作用上并沒有顯著差別
What do you think? Answer true or false to the following.
大家對此有何看法? 請大家對下列問題回答是或否，
Organic food is more nutritious than conventional food.
有機食品是否比傳統食品更加有營養?
And, organic food is safer than conventional food.
有機食品是否比傳統食品更加安全?
Now that you've seen some of the big issues relating to organic and conventional foods,
我們已經看了幾個與有機食品和傳統食品相關的重要問題，
you probably have some questions on whether or not organic produce is worth the extra cost.
大家或許會問花更高的價格購買有機食品是否值得
According to the Whole Foods Market Survey we discussed earlier,
根據我們之前討論過的天然食品市場調查
67% of people who buy organic foods do so because they feel organic foods are healthier.
購買有機食品的人中67%的人是因為他們認為有機食品更加健康
There is a wide spread belief that organic food is healthier,
人們普遍相信，有機食品更加健康
most likely due to the principles associated with organic farming.
這或許和有機農業的幾個原則有感
Organic farming practices largely avoid synthetic fertilizers,
有機農業在生產過程中要避免使用合成化學肥料
pesticides, growth regulators, and livestock feed additives.
殺蟲劑，以及飼料添加劑
Organic farming systems rely on crop rotations, manures, organic waste,
有機農業系統通過谷物發酵糞便，有機排泄物
and biological pest controls to maintain soil productivity,
和利用生物方法防治病蟲害來保證土壤肥力
supply nutrients to growing plants, and control pests.
給作物提供營養和進行病蟲害防治
However, organic farming regulations differ across countries and between certifiers.
但是有機農業的具體規定和監管在各國都是不同的，
The non-use of synthetic chemicals remain part of the allure of the organic movement
不用化學合成的化肥農藥依舊是有機食品廣受歡迎的原因，
and underlie consumer belief that organic food is virtually free of the hazards found in chemical produce.
也就是說，消費者相信有機食品中不含化學品種的危險物質
