Organic food has no nutritional or health benefits over ordinary food, according to a major 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 res
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.
In 1924 American’s National Research Council sent to engineers to supervise a series of industrial experiments at a large telephone-parts factory called the Hawthorne Plant near Chicago. It hoped they would learn how stop-floor lighting (1) workers productivity. Instead, the studies ended (2) giving their name to the "Hawthorne effect", the extremely influential idea that the very (3) to being experimented upon changed subjects’ behavior.
The idea arose because of the (4) behavior of the women in the Hawthorne plant. According to (5) of the experiments, their hourly output rose when lighting was increased, but also when it was dimmed. It did not (6) what was done in the experiment; (7) something was changed, productivity rose. A (n) (8) that they were being experimented upon seemed to be (9) to alter workers’ behavior (10) itself.
After several dec
A. suitable
B. excessive
C. enough
D. abundant
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