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Dietary researcher: A recent study reports that laboratory

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Dietary researcher: A recent study reports that laboratory [#permalink] New post 11 May 2010, 08:47
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A
B
C
D
E

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67% (01:00) correct 33% (03:15) wrong based on 3 sessions
Dietary researcher: A recent study reports that laboratory animals that were fed reduced-calorie diets lived longer than laboratory animals whose caloric intake was not reduced. In response, some doctors are advocating reduced-calorie diets, in the belief that North Americans’ life spans can thereby be extended. However, this conclusion is not supported. Laboratory animals tend to eat much more than animals in their natural habitats, which leads to their having a shorter life expectancy. Restricting their diets merely brings their caloric intake back to natural optimal levels and reinstates their normal life spans.
Which one of the following, if true, would most weaken the dietary researcher’s argument?
(A) North Americans, on average, consume a higher number of calories than the optimal number of calories for a human diet.
(B) North Americans with high-fat, low-calorie diets generally have a shorter life expectancy than North Americans with low-fat, low-calorie diets.
(C) Not all scientific results that have important implications for human health are based on studies of laboratory animals.
(D) Some North Americans who follow reduced-calorie diets are long-lived.
(E) There is a strong correlation between diet and longevity in some species of animals

Answer is
[Reveal] Spoiler:
A


do you agree? i disagree .....
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Re: Dietary Research [#permalink] New post 11 May 2010, 08:54
IMO it should be B
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Re: Dietary Research [#permalink] New post 11 May 2010, 08:59
i thought so too . . . . , A in effect, strengthen the conclusion, is it not?
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Re: Dietary Research [#permalink] New post 11 May 2010, 09:00
IMO A.

Basically A simply illustrates the explanation provided in last two sentences of the question: reduction in calorie doesn't prolong life-span, but restate the normal life-span because humans over-eat.

Also by elimination B C D E can't be right either.
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Re: Dietary Research [#permalink] New post 11 May 2010, 09:20
This is interesting. I think it boils down to what exactly is the conclusion of the Dietary Researcher (DR).

My understanding is that the DR conclusion is:

Not true: In response, some doctors are advocating reduced-calorie diets, in the belief that North Americans’ life spans can thereby be extended.

Supporting Premise (?):

Laboratory animals tend to eat much more than animals in their natural habitats, which leads to their having a shorter life expectancy. Restricting their diets merely brings their caloric intake back to natural optimal levels and reinstates their normal life spans.

Hence, i concluded that it cannot be A?

B provides for an alternate reason (fat) for influencing the length of the life span of North Americans? Hence, "WEAKENING" the conclusion as required by question right?

Last edited by ohfred on 11 May 2010, 09:24, edited 2 times in total.
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Re: Dietary Research [#permalink] New post 11 May 2010, 09:22
B is the clear winner here for me
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Re: Dietary Research [#permalink] New post 11 May 2010, 09:32
thks calvinhobbes, I see why A now, reason is because it is parallel with the supporting evidences regarding the lab animals. But can you explain why you eliminate B?
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Re: Dietary Research [#permalink] New post 11 May 2010, 09:35
ok B weakens the author's conclusion ....we need to weaken the researcher's conclusion so it is actually a strengthen question not weaken question :)


My answer: A
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Re: Dietary Research [#permalink] New post 11 May 2010, 09:54
ohfred wrote:
thks calvinhobbes, I see why A now, reason is because it is parallel with the supporting evidences regarding the lab animals. But can you explain why you eliminate B?


B compares high fat + low cal with low fat + low cal, while fat is never a concern of the question i think? It's out of scope.

Even if it's in scope, this is only a general statement without providing any evidence on whether US people on average are having high fat + low cal diet or low fat + low cal diet.
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Re: Dietary Research [#permalink] New post 11 May 2010, 10:19
can someone please explain this in detail? The premise has been so badly written that it very difficult to understand what is the dietary researchers conclusion and what is the authirs conclusion.
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Re: Dietary Research [#permalink] New post 11 May 2010, 21:52
seekmba wrote:
can someone please explain this in detail? The premise has been so badly written that it very difficult to understand what is the dietary researchers conclusion and what is the authirs conclusion.


Dietary researcher:

Premise:
1. A recent study reports that laboratory animals that were fed reduced-calorie diets lived longer than laboratory animals whose caloric intake was not reduced.

Conclusion:
1. Some doctors advocate reduced-calorie diets, in the belief that North Americans’ life spans can thereby be extended.


Author:

Premise:
1. Laboratory animals tend to eat much more than animals in their natural habitats, which leads to their having a shorter life expectancy.

2. Restricting their diets merely brings their caloric intake back to natural optimal levels and reinstates their normal life spans.

Conclusion:
1. Doctors' conclusion is not supported.
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Re: Dietary Research [#permalink] New post 13 May 2010, 03:53
A it is
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Re: Dietary Research [#permalink] New post 15 May 2010, 06:18
clearly A is the winner
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Re: Dietary Research [#permalink] New post 25 May 2010, 00:27
I'm so enjoying to do GMAT , LSAT CR . They are so freaken cool

In this sentence , it is clearly that A is the winner .

Reseacher found that when you are old enough to have sex , sex is good for you and for your partner . But it is not applicable for you .

Reseacher assume that you are not old enough to have sex --> to weaken it you need to say that you are old enough to have sex .

This is an analogous comparing with this sentence . Research claim that this only work because the subject eat more than its normal diet --> to weaken it, we can say that Northern American consume larger that the norm does
Re: Dietary Research   [#permalink] 25 May 2010, 00:27
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