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A recent study of people who had successfully lost weight

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A recent study of people who had successfully lost weight [#permalink] New post 15 Sep 2012, 23:01
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A recent study of people who had successfully lost weight and implemented regular exercise routines in their twenties found that, by the age of forty, most had gained back the weight, stopped exercising regularly, or both. Surprisingly, among the study's subjects who had hired personal trainers to help them lose weight and exercise in their twenties, an even higher percentage had regained the weight or stopped exercising than among subjects who had not hired such trainers. The researchers concluded not only that remaining on an effective weight management and exercise program is difficult, but also that personal trainers are largely ineffective in helping people to remain on an effective weight management and exercise program.

Which of the following, if true, most weakens the argument in the passage above?

A. Subjects in the study who had hired personal trainers had, on average, more free time to exercise than did those who had not hired such trainers.
B. Some people hire personal trainers for sport-specific training or to rehabilitate injuries, rather than to lose weight or implement a regular exercise program.
C. The average person's metabolism slows significantly between the ages of thirty and forty, making it more difficult for people aged forty or older to avoid weight gain.
D. Many of the personal trainers hired by the people in the study were also dietitians who helped their clients design meal plans.
E. Most people who hire personal trainers do so, at least in part, because they lack sufficient motivation to remain on a diet or exercise regimen by themselves.




I selected option C because it targets the cause mentioned in the conclusion..... Can someone explain the correct ans?
[Reveal] Spoiler: OA

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Re: A recent study of people who had successfully lost weight an [#permalink] New post 16 Sep 2012, 00:22
ravstime wrote:
A recent study of people who had successfully lost weight and implemented regular exercise routines in their twenties found that, by the age of forty, most had gained back the weight, stopped exercising regularly, or both. Surprisingly, among the study's subjects who had hired personal trainers to help them lose weight and exercise in their twenties, an even higher percentage had regained the weight or stopped exercising than among subjects who had not hired such trainers. The researchers concluded not only that remaining on an effective weight management and exercise program is difficult, but also that personal trainers are largely ineffective in helping people to remain on an effective weight management and exercise program.

Which of the following, if true, most weakens the argument in the passage above?

A. Subjects in the study who had hired personal trainers had, on average, more free time to exercise than did those who had not hired such trainers.
B. Some people hire personal trainers for sport-specific training or to rehabilitate injuries, rather than to lose weight or implement a regular exercise program.
C. The average person's metabolism slows significantly between the ages of thirty and forty, making it more difficult for people aged forty or older to avoid weight gain.
D. Many of the personal trainers hired by the people in the study were also dietitians who helped their clients design meal plans.
E. Most people who hire personal trainers do so, at least in part, because they lack sufficient motivation to remain on a diet or exercise regimen by themselves.

I selected option C because it targets the cause mentioned in the conclusion..... Can someone explain the correct ans?


Correct Choice is E.
According to C all subjects in the study will regain weight and there will be no difference between groups with PT and groups without PT.
The conclusion is "The researchers concluded not only that remaining on an effective weight management and exercise program is difficult, but also that personal trainers are largely ineffective in helping people to remain on an effective weight management and exercise program."
E brings out an alternate reasoning by showing that people with PT were partly lacking sufficient motivation to remain on diet & exercise. So the conclusion that PT are ineffective is falsified.
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Re: A recent study of people who had successfully lost weight an [#permalink] New post 17 Sep 2012, 01:13
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I strongly feel that B is the answer. E does not account for the increase in weight loss in the 40's alone.Well if the people who lack self motivation hired trainers ,why is that they gained weight only in the 40's and not earlier.It is no where mentioned that the recipients are not under the guidance of the trainers in their 40's .
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Re: A recent study of people who had successfully lost weight an [#permalink] New post 17 Sep 2012, 04:02
saikarthikreddy wrote:
I strongly feel that B is the answer. E does not account for the increase in weight loss in the 40's alone.Well if the people who lack self motivation hired trainers ,why is that they gained weight only in the 40's and not earlier.It is no where mentioned that the recipients are not under the guidance of the trainers in their 40's .



B does not differentiate the two groups and will not weaken the argument that personal trainers are largely ineffective in helping people to remain on an effective weight management and exercise program.

While E does tell has that its not the fault of trainers or that trainers are ineffective
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Re: A recent study of people who had successfully lost weight an [#permalink] New post 18 Sep 2012, 07:03
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ravstime wrote:
A recent study of people who had successfully lost weight and implemented regular exercise routines in their twenties found that, by the age of forty, most had gained back the weight, stopped exercising regularly, or both. Surprisingly, among the study's subjects who had hired personal trainers to help them lose weight and exercise in their twenties, an even higher percentage had regained the weight or stopped exercising than among subjects who had not hired such trainers. The researchers concluded not only that remaining on an effective weight management and exercise program is difficult, but also that personal trainers are largely ineffective in helping people to remain on an effective weight management and exercise program.

Which of the following, if true, most weakens the argument in the passage above?

A. Subjects in the study who had hired personal trainers had, on average, more free time to exercise than did those who had not hired such trainers.
B. Some people hire personal trainers for sport-specific training or to rehabilitate injuries, rather than to lose weight or implement a regular exercise program.
C. The average person's metabolism slows significantly between the ages of thirty and forty, making it more difficult for people aged forty or older to avoid weight gain.
D. Many of the personal trainers hired by the people in the study were also dietitians who helped their clients design meal plans.
E. Most people who hire personal trainers do so, at least in part, because they lack sufficient motivation to remain on a diet or exercise regimen by themselves.




I selected option C because it targets the cause mentioned in the conclusion..... Can someone explain the correct ans?


Premise - A recent study of people who had successfully lost weight and implemented regular exercise routines in their twenties found that, by the age of forty, most had gained back the weight, stopped exercising regularly, or both. Surprisingly, among the study's subjects who had hired personal trainers to help them lose weight and exercise in their twenties, an even higher percentage had regained the weight or stopped exercising than among subjects who had not hired such trainers.

Conclusion - The researchers concluded not only that remaining on an effective weight management and exercise program is difficult, but also that personal trainers are largely ineffective in helping people to remain on an effective weight management and exercise program.

Anything which weakens the conclusion is our answer

A. Subjects in the study who had hired personal trainers had, on average, more free time to exercise than did those who had not hired such trainers. (Irrelevant)
B. Some people hire personal trainers for sport-specific training or to rehabilitate injuries, rather than to lose weight or implement a regular exercise program. (Irrelevant)
C. The average person's metabolism slows significantly between the ages of thirty and forty, making it more difficult for people aged forty or older to avoid weight gain. (This should be common to all and not just to those who exercised or maintained trainer)
D. Many of the personal trainers hired by the people in the study were also dietitians who helped their clients design meal plans. (It does not help us in anyway, although close)
E. Most people who hire personal trainers do so, at least in part, because they lack sufficient motivation to remain on a diet or exercise regimen by themselves. (This is our answer, it shows that personal trainers were more of a source of motivation than just trainers. So by 40’s the people in the survey had no trainer and no motivation to do exercise and thus gained weight)

Hope this helps !
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Re: A recent study of people who had successfully lost weight [#permalink] New post 25 Oct 2012, 01:24
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i think B and E both does the same thing showing third thing as the cause, but E wins just because it mentions the word "Most" and B mentions " Some"
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Re: A recent study of people who had successfully lost weight [#permalink] New post 16 Nov 2013, 02:20
E is your best answer

B a close contender, however it targets a wrong group by generalizing i.e " some people" while the argument claims that those who hire personal trainers are worse of those who do not. On the other hand, E address the flaw with people who hire personal trainers
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Re: A recent study of people who had successfully lost weight [#permalink] New post 03 Feb 2014, 09:59
Archit143 wrote:
i think B and E both does the same thing showing third thing as the cause, but E wins just because it mentions the word "Most" and B mentions " Some"



I chose B ...I missed "some" and "most". Perfect reasoning.

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Re: A recent study of people who had successfully lost weight [#permalink] New post 10 Aug 2014, 07:23
What about option C. It says that in the forties, the metabolism doesn't allow to loose weight easily and thus provides us with a third reason. Also there is two parts of the conclusion and both should be answered, so not only the PTs are being questioned but also the general effectiveness of the program.
Option C gives the explanation to both the parts.
Re: A recent study of people who had successfully lost weight   [#permalink] 10 Aug 2014, 07:23
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