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People with higher-than-average blood levels of a normal dietary

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People with higher-than-average blood levels of a normal dietary  [#permalink]

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New post 18 Aug 2017, 05:13
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Question Stats:

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People with higher-than-average blood levels of a normal dietary by-product called homocysteine are twice as likely to be diagnosed with Alzheimer's disease as are those with average or below-average homocysteine levels. Thus, it is likely that the risk of developing Alzheimer's disease could be reduced by including in one's diet large amounts of B vitamins and folic acid, which convert homocysteine into substances known to have no relation to Alzheimer's disease.

Which one of the following, if true, most seriously weakens the argument?

(A) Many Alzheimer's patients have normal homocysteine levels.

(B) The substances into which homocysteine is converted can sometimes have harmful effects unrelated to Alzheimer's disease.

(C) B vitamins and folic acid are not metabolized by the body very efficiently when taken in the form of vitamin-mineral supplements.

(D) People whose relatives contracted Alzheimer's disease are much more likely to develop Alzheimer's than those whose relatives did not.

(E) Alzheimer's disease tends to increase the levels of homocysteine in the blood.
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People with higher-than-average blood levels of a normal dietary  [#permalink]

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New post Updated on: 02 Sep 2017, 00:08
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ganand wrote:
People with higher-than-average blood levels of a normal dietary by-product called homocysteine are twice as likely to be diagnosed with Alzheimer's disease as are those with average or below-average homocysteine levels. Thus, it is likely that the risk of developing Alzheimer's disease could be reduced by including in one's diet large amounts of B vitamins and folic acid, which convert homocysteine into substances known to have no relation to Alzheimer's disease.

Which one of the following, if true, most seriously weakens the argument?

(A) Many Alzheimer's patients have normal homocysteine levels.

(B) The substances into which homocysteine is converted can sometimes have harmful effects unrelated to Alzheimer's disease.

(C) B vitamins and folic acid are not metabolized by the body very efficiently when taken in the form of vitamin-mineral supplements.

(D) People whose relatives contracted Alzheimer's disease are much more likely to develop Alzheimer's than those whose relatives did not.

(E) Alzheimer's disease tends to increase the levels of homocysteine in the blood.



Answer: E

Stimuli says that Alzheimer risk will reduce if we reduce the amount of homocysteine in the body.

Choice E directly weakens the above statement, saying homocysteine is not the reason for Alzheimer rather Alzheimer is the reason of increase of in homocysteine the body.

Originally posted by atomicmass on 27 Aug 2017, 07:29.
Last edited by atomicmass on 02 Sep 2017, 00:08, edited 1 time in total.
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Re: People with higher-than-average blood levels of a normal dietary  [#permalink]

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New post 27 Aug 2017, 10:42
ganand wrote:
People with higher-than-average blood levels of a normal dietary by-product called homocysteine are twice as likely to be diagnosed with Alzheimer's disease as are those with average or below-average homocysteine levels. Thus, it is likely that the risk of developing Alzheimer's disease could be reduced by including in one's diet large amounts of B vitamins and folic acid, which convert homocysteine into substances known to have no relation to Alzheimer's disease.

Which one of the following, if true, most seriously weakens the argument?

(A) Many Alzheimer's patients have normal homocysteine levels.

(B) The substances into which homocysteine is converted can sometimes have harmful effects unrelated to Alzheimer's disease.

(C) B vitamins and folic acid are not metabolized by the body very efficiently when taken in the form of vitamin-mineral supplements.

(D) People whose relatives contracted Alzheimer's disease are much more likely to develop Alzheimer's than those whose relatives did not.

(E) Alzheimer's disease tends to increase the levels of homocysteine in the blood.



clear example of cause - effect relationship...
argument implies homocysteine leads to alzheimers...
but E weakens by stating the opposite
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Re: People with higher-than-average blood levels of a normal dietary  [#permalink]

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New post 27 Aug 2017, 12:22
People with higher-than-average blood levels of a normal dietary by-product called homocysteine are twice as likely to be diagnosed with Alzheimer's disease as are those with average or below-average homocysteine levels. Thus, it is likely that the risk of developing Alzheimer's disease could be reduced by including in one's diet large amounts of B vitamins and folic acid, which convert homocysteine into substances known to have no relation to Alzheimer's disease.

Which one of the following, if true, most seriously weakens the argument?

(A) Many Alzheimer's patients have normal homocysteine levels.
Fact Statement. Twice as likely doesn't mean that Alzheimer's patients can't have normal level of homocysteine levels

(B) The substances into which homocysteine is converted can sometimes have harmful effects unrelated to Alzheimer's disease.
Not worried about other harmful effects

(C) B vitamins and folic acid are not metabolized by the body very efficiently when taken in the form of vitamin-mineral supplements.
Okay, then give the vitamin and acid in some other form. Irrelevant

(D) People whose relatives contracted Alzheimer's disease are much more likely to develop Alzheimer's than those whose relatives did not.
Okay, let it be the case. Still the patients will have high homocysteine levels

(E) Alzheimer's disease tends to increase the levels of homocysteine in the blood.
Correct. It reverses the causallity. Alzheimer's disease causes high levels of homocysteine
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Re: People with higher-than-average blood levels of a normal dietary  [#permalink]

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New post 27 Sep 2018, 23:57
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Re: People with higher-than-average blood levels of a normal dietary   [#permalink] 27 Sep 2018, 23:57
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