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162.A recent study shows that people living on the continent of North America suffer 9 times more chronic fatigue and 31 times more chronic depression than do people living on the continent of Asia. Interestingly, Asians, on average, eat 20 grams of soy per day, whereas North Americans eat virtually none. It turns out that soy contains phytochemicals called isoflavones, which have been found to possess disease-preventing properties. Thus, North Americans should consider eating soy on a regular basis as a way of preventing fatigue and depression.
In this argument, the author asserts that eating soy frequently can be an effective way of preventing fatigue and depression, citing a recent study which shows that Asian people, who, on average, eat 20 grams of soy per day, suffer much less chronic fatigue and depression than North American people do. To support his assertion he also points out that soy contains phytochemicals called isoflavones, which can avoid some diseases. As it stands, the argument suffers from several critical flaws as follows.
First and foremost, the author doesn't offer the details of this study, which can be unreliable if it is carried out imprecisely. Even if the study turns out to be reliable, it is possible that fatigue and depression is more difficult to be diagnosed in Asian, which may be related to the indifference of Asian people and the inaccurate diagnosis of Asian doctors. Occasionally, headache, dizziness, lack of strength, stagnancy, or other symptoms, which actually are connected with fatigue or depression, can be misdiagnosed as lack of sleep or food poisoning.
Secondly, the author assumes that the different amounts of suffering people were only due to the discrepancy between the soy-eating amounts of two areas. Yet the argument fails to corroborate it. Common sense informs me that there might be other explanations such as environment, diet, and gene. If a person lives in a zone which is crammed with noise, exhaust gas and light pollution, or is on an improper diet, or gains some bad genes from his/her parents, happens to be more possible to suffer diseases especially fatigue and depression.
Finally, isoflavones, which proved to be a component of soy, possess disease-preventing properties. But the author fails to prove that the diseases which can be avoided by isoflavones might not include fatigue and impression. Moreover, whether fatigue and depression are suitably classified as diseases is debatable.
In sum, both the study and the conclusion mentioned in this argument are dubious. To confirm it the author should provide more accurate details of this study and offer the evidence that the investigator did use the same criterion of diagnosis in two areas. What's more, the author should bolster his argument by proving that no other factors do much on the occurrence of fatigue and depression and isoflavones can treat them. |
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