A new weight-loss drug causes the loss of body fat in all : GMAT Critical Reasoning (CR)
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# A new weight-loss drug causes the loss of body fat in all

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A new weight-loss drug causes the loss of body fat in all [#permalink]

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02 Aug 2010, 01:08
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A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where “lean body mass” refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
The body weight of patients taking the new weight-loss drug will not necessarily decrease.
The new weight-loss drug contains no chemical that exclusively targets the body’s fat cells.
Users of the new weight-loss drug should exercise in order to maintain their current levels of lean body mass.
The new drug catalyzes the loss of body fat and the loss of lean body mass via similar mechanisms.
[Reveal] Spoiler: OA

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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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02 Aug 2010, 01:50
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maheshsrini wrote:
A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where “lean body mass” refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
The body weight of patients taking the new weight-loss drug will not necessarily decrease.
The new weight-loss drug contains no chemical that exclusively targets the body’s fat cells.
Users of the new weight-loss drug should exercise in order to maintain their current levels of lean body mass.
The new drug catalyzes the loss of body fat and the loss of lean body mass via similar mechanisms.

IMO A.

Premise 1: Patients will lose body fat
Premise 2: Patients will also lose lean body mass (defined as everything that isn't fat)
A: Takes into account both premises and recognizes that percentage of body fat may remain unchanged even if person loses fat. (Absolutes vs. Percentages)
B: People will lose weight if they take the drug.
C: Also a contender, but the chemicals in the drug are beyond the scope of the question...IMO
D: Exercise is never discussed and hence beyond the scope of the question
E: This is largely an assumption because what catalyzes the loss of body fat and lean muscle is never discussed and also beyond the scope of the qeusiton
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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02 Aug 2010, 12:18
A for me.

Total fat --> 40%
Body Mass --> 60%

After taking the drug, both body fat and body mass decrease.

So, when taking both together, the body fat has not decreased much.
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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02 Aug 2010, 21:40
Hi all. I went for C.
The reason why I thought A is incorrect is because, the argument never mentions that the drug drains both the fat and the lean body mass in similar proportions. It says "the drug also causes the loss of moderate quantities of lean body mass" Hence, the fat reduction is higher than the "lean body mass" reduction..

C mentions that "there is no chemical that affects only the body's fat cells", which IMO is correct..

Share your thoughts guys..
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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02 Aug 2010, 22:23
sridhar wrote:
Hi all. I went for C.
The reason why I thought A is incorrect is because, the argument never mentions that the drug drains both the fat and the lean body mass in similar proportions. It says "the drug also causes the loss of moderate quantities of lean body mass" Hence, the fat reduction is higher than the "lean body mass" reduction..

C mentions that "there is no chemical that affects only the body's fat cells", which IMO is correct..

Share your thoughts guys..

A is correct because it takes into account the fact that a person is losing both fat and lean muscle mass, but you don't know in which quantities so taking the drug will not necessarily result in a reduction in body fat.
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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31 Aug 2010, 21:55
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For an inference question, try to stick as close to the given premises as you can-- any jump in logic must be fully justified. With that in mind, attack the choices:

Choice (A) uses one of those wishy washy phrases that can be hard to argue with: "not necessarily." Maybe people who take the drug will decrease their percentage of body fat, maybe not. Another phrase that should set off mental alarm bells here is "overall percentage"--I'm with Gryphon here. We've all of a sudden shifted from a discussion of absolute quantities (mass) in the argument to relative quantities (percentage). Look at this concrete example:

Bob weighs 200 pounds, 20 lbs of which is body fat. Bob's mass is therefore 10% (20/200) body fat.

He takes the drug and loses 1 pound of body fat, AND
9 pounds of lean muscle mass. He has lost a total of 10 pounds, so weighs 190 pounds, 19 pounds of which are body fat. He is still 10% (19/190) body fat. This is NOT a decrease in overall percentage of body fat.

BUT what about sridar's suggestion that the word "moderate" implies that the person loses more fat than lean body mass? In real life, this might be a perfectly reasonable assumption to make-- on the GMAT, however, AVOID making assumptions unless you absolutely have to. Even if you weren't convinced, leave choice A for now and look at the others.

Choice (B) also uses "not necessarily"--but here you can disprove it clearly. If the body's mass is composed entirely of body fat and lean body mass, and both decrease, then the person's weight WILL necessarily decrease. Eliminate.

Nothing is mentioned in the argument about the chemical composition of the drug, or any kind of targeting. Just because the drug causes loss of body fat doesn't mean it targets fat cells. Maybe it targets something else and the effect on fat cells is a side effect. (Look at the runaway success of Latisse, which was a glaucoma medication that happened to grow eyelashes, and now is a blockbuster vanity drug.) Choice (C) is out.

I couldn't put it any more succinctly than Gryphon did regarding choices (D) an (E), so won't try here. They're out too, for the reasons listed in the above post.

Despite sridar's very reasonable reservations about the word "moderate"-- the other choices have large fatal errors, and what "moderate" means is never laid out in the argument. A is the last choice left standing.
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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01 Sep 2010, 01:07
A for me
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01 Sep 2010, 14:35
IMO A
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02 Sep 2010, 07:35
A for me 2
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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03 Sep 2010, 04:51
A for me too
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03 Sep 2010, 10:09
I picked C first... But after reading parker's explanation of overall percentage I am convinced with option A.

Thanks Parker
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Re: Fat Cat(alyst) -MGMAT CR [#permalink]

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03 Sep 2010, 15:03
I wanted to click A without reading other answers ... but I did it and clicked A anyway -- now thinking, if I were in real gmat test - would it be worth it to save 30 sec. but not to be certain about other answers?
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Re: A new weight-loss drug causes the loss of body fat in all [#permalink]

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28 Mar 2014, 22:30
Such kind of drug or nicotine or pill's are harmful for few time after take drug lot more unwanted causes are increases under the specialist take such kind of prescription. Either than Regular diet take healthy nutrition changing unhealthy eating behaviors regular exercise regular cardio,skipping options to reach your fitness goals.
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Re: A new weight-loss drug causes the loss of body fat in all [#permalink]

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24 Sep 2014, 21:34
Eating less and moving more are the basics of weight loss that lasts. For some people, prescription weight loss drugs may help.

You'll still need to focus on diet and exercise while taking these drugs, and they're not for everyone.

Doctors usually prescribe them only if your BMI is 30 or higher, or if it's at least 27 and you have a condition that may be related to your weight, like type 2 diabetes or high blood pressure.

Here's what you should know about four of the most common prescription weight loss drugs: orlistat, Belviq, phentermine, and Qsymia.

Before you get a weight loss drug prescription, tell your doctor about your medical history. That includes any allergies or other conditions you have; medicines or supplements you take (even if they're herbal or natural); and whether you're pregnant, breastfeeding, or planning to get pregnant soon.
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Re: A new weight-loss drug causes the loss of body fat in all [#permalink]

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26 Oct 2015, 15:48
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