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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, 08:35
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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, 09:28
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. >>> Out of scope, there is no discussion about the shifting of threshold 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. >>> They can actually increase their consumption without affecting the 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. >>> CORRECT, because threshold lies at 1/4 the present consumption and even if the consumption is reduced by half, it doesn't goes below the threshold.
(D) Serum cholesterol levels cannot be affected by non-dietary modifications in behavior by non-dietary modifications in behavior, such as exercising more or smoking less. >>> Out of scope, there is no discussion about the non-dietary modifications
(E) People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels >>> People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels can actually decrease their serum cholesterol levels.

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29 Apr 2010, 09:43
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29 Apr 2010, 11:55
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.
(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

People consuming half as much cholesterol are still above the threshold. Since above the threshold limit fat consumption vs serum cholesterol levels are not proportional, average serum cholesterol level can not be halved.
_________________

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Re: 1000cr:cholesterol and fat   [#permalink] 29 Apr 2010, 11:55
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# Q30)A person s dietary consumption of cholesterol and fat is

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