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Organic food has no nutritional or health benefits over ordinary food, according to a majo

r study.

Researchers from the London School of Hygiene & Tropical Medicine said consumers were paying higher prices for organic food because of its imagined health benefits, creating a global organic market worth an estimated $48 billion in 2007.

A systematic review of 162 scientific papers published in the scientific literature over the last 50 years, however, found there was no significant difference.

"A small number of differences in nutrient content were found to exist between organically and conventionally (通常) produced foodstuffs, but these have nothing to do with public health, " said Alan Dangour, one of the report's authors.

"Our review indicates that there is currently no evidence to support the selection of organically over conventionally produced foods on the basis of nutritional superiority . "

The results of research, which was commissioned by the British government's Food Standards Agency, were published in the American Journal of Clinical Nutrition.

Sales of organic food have fallen in some markets, including Britain, as a slowdown in economic growth has led consumers to cut back on purchases.

The Soil Association said that growth in sales of organic products in Britain slowed to just 1.7percent, well below the average annual growth rate of 26 percent over the last decade.

Why does organic food cost more than conventionally produced food？

A．Because people think they are much healthier.

B．Because they are more delicious.

C．Because people prefer organic food.

D．Because they sell better.

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更多“Organic food has no nutritiona…”相关的问题

第1题

Increasingly, over the past ten years, people -- especially young people have become aware

of the need to change their eating habits, because much of the food they eat, particularly processed food, is not good for the health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers, widely used in farming today.

Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount-- but not the quality -- of foods grown in commercial farming areas.

Natural foods also include animals which have been allowed to feed and move freely in healthy pastures. Compare this with what happens in the mass production of poultry: there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins.

There are other aspects of healthy eating which are now receiving increasing attention from experts on diet. It is significant that nowadays fiber is considered to be an important part of a healthy diet. In white bread, for example, the fiber has been removed. But it is presented in unrefined flour and of course in vegetables. It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetables, certain diseases are comparatively rare. Hence emphasis placed on the eating of whole meal bread and more vegetables by modem experts on "healthy eating."

According to this passage, people becoming interested in natural foods because ______.

A．they are getting fired of processed foods

B．they want to change their eating habits

C．a lot of the foods they eat is not healthy

D．food experts recommend them to have natural foods

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第2题

Which sentence is TRUE？A．Fast food is popular because of the high fat.B．Fast food is good

Which sentence is TRUE？

A．Fast food is popular because of the high fat.

B．Fast food is good to us.

C．Fast food has rich nutrients.

D．Fast food has its advantage and disadvantage.

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第3题

Which of the following has nothing to do with the meeting chaired by Premier Wen？A.Discuss

ing the building of rapid-transit rails.B.Discussing the draft amendments concerning some banks.C.Discussing the draft regulations about food reserves.D.Discussing whether the People's Bank of China and commercial banks should be integrated.

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第4题

Talking about eating habit, unlike the west,____everyone has their own plate of food, in C

hina the dishes are placed on the table and everybody shares.

A.of which

B.when

C.where

D.by which

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第5题

Vitamins are organic compounds necessary in small amounts in the diet for the normal growt

h and maintenance of life of animals, including man.

They do not provide energy,【21】do they construct or build any part of the body. They are needed for【22】foods into energy and body maintenance. There are thirteen or more of them, and if【23】is missing a deficiency disease becomes【24】.

Vitamins are, similar because they are made of the same elements--usually carbon, hydrogen, oxygen, and【25】nitrogen. They are different【26】their elements are arranged differently, and each vitamin【27】one or more specific functions in the body.

【28】enough vitamins is essential to life, although the body has no nutritional use for【29】vitamins. Many people,【30】, believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all the body's vitamin needs.

(36)

A．either

B．so

C．nor

D．never

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第6题

Which of the following is NOT true？A. Colour probably has an effect on us which we are not

Which of the following is NOT true？

A. Colour probably has an effect on us which we are not conscious of.

B. Our feelings about certain colours are purely psychology.

C. Food should never be packaged in brown.

D. Sugar sells badly in green wrappings.

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第7题

Man must eat in order to live. One of the most important concerns of man during his life o

n the earth has been to makecertain that he has enough food to eat when he needs it.

Prehistoric (史前的）had little choice in what he ate. He ate what he could find: roots, eggs, fruits and the meat of smallanimals. Early man had no way to control his food supply. If there was no rain, or the weather was too hot or too cold,plants would not grow, and he would have little or no food. When he ate all the food in one place, he had to move to anotherregion for food.

Man’s life changed when he learned to grow plants and to raise animals. He also learned to use fire to prepare his food. Later, he learned to make tools and weapons, and to make containers to store his food. Man could now live in one place andproduce his own food. So civilization (文明）began. Great civilizations slowly developed in regions where food wasplentiful — along the Nile River in Egypt, and by the Yellow River in China.

The kinds of plants which are raised by man are different in each geographical region. In the colder regions very fewplants can be grown; in the warmer parts of the world great varieties of plants are found. In Asia, rice has become the mostimportant crop. In North America, the most important grains are wheat and com. In Europe and North Africa, wheat is themain crop. In the tropical (热带的）regions of the world，many kinds of fruit grow naturally or arc planted by man.

With the development of methods of keeping food fresh, it became possible to send most food products from one partof the world to another. Today foods are kept fresh in many ways and sent all over the world. Man no longer depends on thefood he grows in his own area only.

As man has learned more about plants and animals, the production of food has become a more technical process. In thefuture, it seems possible that vast quantities of food may come from the ocean. Food may also be produced in new ways.

According to the first paragraph.man has to ensure________

A.the amount of food he needs

B.the quality of the food he needs

C.the quality of his lifeon theearth

D.the number of people livingon the earth

If the weather was extremely bad, early man would？A.raise new crops

B.suffer from hunger

C.raise small animals

D.suffer from diseases

From Paragraph 3 we know that civilizations developed in areas？A.where the weather was good

B.where there was enough rain

C.where there was a large amountof food

D.where there were a great numberof animals

Which of the following is true according to Paragraph 4？A.There are few plants in colder regions.

B.Corn is the most important crop in Asia.

C.There are few plants in hotter regions.

D.Rice is the main crop in Europe.

As man’s knowledge about plants and animals increases,.A.fewer plants will be needed

B.fewer animals will he available

C.more and more land will be

D.more and more food will he available

请帮忙给出每个问题的正确答案和分析，谢谢！

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第8题

Another thing an astronaut has to learn about is eating in space. Food is weightless, just

as men are.

Food for space has to be packed in special ways. Some of it goes into tubes that a man can squeeze into his mouth. Bite-sized cookies are packed in plastic.

There is a good reason for covering each bite. The plastic keeps pieces of food from travelling in the spaceship. On the earth very small pieces of food would simply fall to the floor. But gravity doesn' t pull them to the floor when they are out of the plastic in a spaceship. (78) They move here and there and can get into a man' s eyes or into the spaceship' s instruments. If any of the instruments is blocked, the astronauts may have trouble getting safely home.

As astronauts travel on longer space trips, he must take time to sleep. An astronaut can fit himself to his seat with a kind of seat belt. Or, if he wants to, he can sleep in a sleeping bag which is fixed in place under his seat. But be careful he must put his hands under the belt when he goes to sleep. This is because he is really afraid that he might touch one of controls that isn' t supposed to be touched until later.

Why would astronauts cover each bite of food in space？

A．Because small pieces of food would fall down to the floor.

B．Because weightless pieces of food might make trouble when they travel around.

C．Because they haven' t enough food for longer trips.

D．Because astronauts don' t want to waste food.

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第9题

In the last sentence of Paragraph 3 , "fewer but larger farms and fewer but more prosperou

s farmers" means

A．hired help is seldom needed

B．productivity on the farms has been raised greatly

C．productivity on the farms has fallen sharply

D．more food is never needed

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第10题

Which of the following is NOT mentioned or implied by the author？（)A．The sloth has only

Which of the following is NOT mentioned or implied by the author？ ()

A．The sloth has only three toes

B．The sloth lives in the damp jungle of South America

C．The sloth usually tries to find a new spot for food at night

D．The sloth will never fight with other animals

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第11题

Vitamins are organic compounds necessary in small amounts in the diet for the normal growt

h and maintenance of life of animals, including man.

They do not provide energy,【31】do they construct or build any part of the body. They are needed for【32】foods into energy and body maintenance. There are thirteen or more of them, and if【33】is missing a deficiency disease becomes【34】

Vitamins are similar because they are made of the same elements—usually carbon, hydrogen, oxygen, and【35】nitrogen. They are different【36】their elements are arranged differently, and each vitamin【37】one or more specific functions in the body.

【38】enough vitamins is essential to life, although the body has no nutritional use for【39】vitamins. Many people,【40】, believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all the body's vitamin needs.

(31)

A．either

B．so

C．nor

D．never

点击查看答案

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