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发表于 2010-7-27 23:06:59
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本帖最后由 starfirezhu 于 2010-7-27 23:34 编辑
TOPIC: ARGUMENT187 - The following appeared as part of an article in a health magazine.
"A new discovery warrants a drastic change in the diets of people living in the United States. Two scientists have recently suggested that omega -3 fatty acids (found in some fish and fish oils) play a key role in mental health. Our ancestors, who ate less saturated fat and more polyunsaturated fat, including omega -3 fatty acids, were much less likely to suffer from depression than we are today. Moreover, modern societies-such as those in Japan and Taiwan-that consume large quantities of fish report depression rates lower than that in the United States. Given this link between omega -3 fatty acids and depression, it is important for all people in the United States to increase their consumption of fish in order to prevent depression."
WORDS: 488 TIME: 00:29:58 DATE: 2010-7-27 21:26:10
[Introduction...]
The arguer recommends that all people in the United States should eat more fish in order to prevent depression. To make it more substantiated, the arguer points out a recent scientific study and the fact that ancestors ingested more omega -3 fatty acids and hence suffered from depression. Moreover, the arguer renders that (residents in Asian societies countries which where people) asian peole consume large amounts of fish and they have less depression rates. However, this argument suffers from several flaws.
[Other factors should be taken into consideration...so many differences: eating habit, environment and living pressure... So the omega-3 fatty acids do not necessarily contribute to lower depression rate...]
Firstly, the arguer fails to take into consideration other factors which might keep out ancestors far away from depression. (Our ancestors and people living in the modern cities have all kinds of difference) Our ancestors differs from morden people in many different aspects, such as eating habit and living environment. Perhaps our ancestors can tend to like have some food which help lower the depression rate and are uncommon in the diet of a modern American. Or perhaps our ancestors did not have to withstand high pressure from competition as modern people. Moreover, they can breath fresher air and eat healtheir food. All in all, without ruling out these and other possibilities, it is unreasonable to conclude that omega -3 fatty should be responsible for the relatively low depression rate among our ancestors.
[Even if the Omega-3 fatty acids are effective, they might not be equally found in all fishes...]
Secondly, the arguer presumptuously assumes that large consumption of fish in Asian societies should be responsible to the low depression rate. Even if we accept the arguer's assumption we discussed above, that is, omega -3 fatty acids do help lower the general depression rate, we cannot conclude it is the large consumption of fish that help Asian people less likely to suffer from depression. It is very likey that only few kinds of fish contain omega -3 fatty acids and Asian people do not consume them. Or their eating habits may also affect depression rate, considering the huge difference lies in the diets of between western countries and eastren countries.
[Consider different cooking methods...human races...]
Thirdly, the arguer commits a false analogy. Even if large consumption of fish does lower depression rates in Asia, the arguer cannot justifiably suggest that American will also gain similar befefit from it. Perhaps the way Asian people cook fish is completely different from that of Americans. Therefore, Asian dishes of fish tend to retain much more omega -3 fatty acids due to the cooking method while American dishes of fish lose nearly all the omega -3 fatty acids. Or perhaps the digestion system of Asian people are different from that of Americans, that is to say, they can absorb omega -3 fatty acids more easily given the fact that they have been eating fish for such a long time.
[Conclusion...]
To sum up, the argument is well presented, but not thoroughly reasoned. To make it more logically acceptable, the arguer should make a scientific analysis about those Asian societies and our ancestors to convince us that omega -3 fatty acids contained in fish do ensure lower depression rate. In addition, the aruguer should make sure that Americans can gain similar benefits from the measure recipe the arguer suggests. Finally, the argument will be more acceptable if the aruger tells us which kind of fish contain more omega -3 fatty acids. |
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