Q30)A person s dietary consumption of cholesterol and fat is : GMAT Critical Reasoning (CR)
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Q30)A person s dietary consumption of cholesterol and fat is

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Q30)A person s dietary consumption of cholesterol and fat is [#permalink]

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29 Apr 2010, 08:24
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Q30)A person’s dietary consumption of cholesterol and fat is one of the most important factors determining the level of cholesterol in the person’s blood (serum cholesterol). Serum cholesterol levels rise proportionally to increased cholesterol and fat consumption until that consumption reaches a threshold, but once consumption of these substances exceeds that threshold, serum cholesterol levels rise only gradually, even with dramatic increases in consumption. The threshold is one fourth the consumption level of cholesterol and fat in today’s average North American diet.
The statements above, if true, most strongly support which one of the following?
(A) The threshold can be lowered by lowering the dietary consumption of cholesterol and fat.
(B) People who consume an average North American diet cannot increase their consumption of cholesterol and fat without dramatically increasing their serum cholesterol levels.
(C) People who consume half as much cholesterol and fat as in the average North American diet will not necessarily have half the average serum cholesterol level.
(D) Serum cholesterol levels cannot be affected by nondietary modifications in behavior by nondietary modifications in behavior, such as exercising more or smoking less.
(E) People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels
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29 Apr 2010, 13:42
Q30)A person’s dietary consumption of cholesterol and fat is one of the most important factors determining the level of cholesterol in the person’s blood (serum cholesterol). Serum cholesterol levels rise proportionally to increased cholesterol and fat consumption until that consumption reaches a threshold, but once consumption of these substances exceeds that threshold, serum cholesterol levels rise only gradually, even with dramatic increases in consumption. The threshold is one fourth the consumption level of cholesterol and fat in today’s average North American diet.
The statements above, if true, most strongly support which one of the following?
(A) The threshold can be lowered by lowering the dietary consumption of cholesterol and fat.
(B) People who consume an average North American diet cannot increase their consumption of cholesterol and fat without dramatically increasing their serum cholesterol levels.
(C) People who consume half as much cholesterol and fat as in the average North American diet will not necessarily have half the average serum cholesterol level.
(D) Serum cholesterol levels cannot be affected by nondietary modifications in behavior by nondietary modifications in behavior, such as exercising more or smoking less.
(E) People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels

My Ans:C.

Option (A) The threshold can be lowered by lowering the dietary consumption of cholesterol and fat.
Here we don't have any information about how we could decrease the thrushhold level.

(B) People who consume an average North American diet cannot increase their consumption of cholesterol and fat without dramatically increasing their serum cholesterol levels.
According to stimulus, whatever the drastic increase in consumption , serum cholestrol level increases gradually.
but here, it explains that people cant increse consumption without dramatic increase in cholestrol level.
It is opposite to the stimulus. So it is wrong.

(C)It is OK.

(D) Serum cholesterol levels cannot be affected by nondietary modifications in behavior by nondietary modifications in behavior, such as exercising more or smoking less.
we dont have any information about the non dietry modification behaviour.So it is wrong.

E) People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels
we dont have any info regarding how we can reduce the cholestral level.
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30 Apr 2010, 06:03
RaviChandra wrote:
Q30)A person’s dietary consumption of cholesterol and fat is one of the most important factors determining the level of cholesterol in the person’s blood (serum cholesterol). Serum cholesterol levels rise proportionally to increased cholesterol and fat consumption until that consumption reaches a threshold, but once consumption of these substances exceeds that threshold, serum cholesterol levels rise only gradually, even with dramatic increases in consumption. The threshold is one fourth the consumption level of cholesterol and fat in today’s average North American diet.
The statements above, if true, most strongly support which one of the following?
(A) The threshold can be lowered by lowering the dietary consumption of cholesterol and fat. There is not talk of reducing the threshold
(B) People who consume an average North American diet cannot increase their consumption of cholesterol and fat without dramatically increasing their serum cholesterol levels. Consumption of cholestrol and fat increases serum cholesterol level, not the other way around
(C) People who consume half as much cholesterol and fat as in the average North American diet will not necessarily have half the average serum cholesterol level.
(D) Serum cholesterol levels cannot be affected by nondietary modifications in behavior by nondietary modifications in behavior, such as exercising more or smoking less. This is more an assumption
(E) People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels We are only concerned about who is consuming more than threshold.

Threshold level =1/4th consumption level
Reduction = 1/2 of consumption level

So the consumption level is still above threshold. since increase in serum cholesterol is not proportional beyond threshold, decrease in 50% cholesterol will not necessarily decrease the average serum Cholesterol by half.

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30 Apr 2010, 06:06
yOU agree with C... nice explanation
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03 May 2010, 11:13
should be (C)
Re: 1000cr:cholesterol and fat   [#permalink] 03 May 2010, 11:13
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